4.3 Övningar
Sommarmatte 1
Versionen från 30 april 2007 kl. 15.08 (redigera) Ossiang (Diskussion | bidrag) (→Övning 4.3:5) ← Gå till föregående ändring |
Nuvarande version (31 maj 2007 kl. 07.05) (redigera) (ogör) KTH.SE:u1rp004j (Diskussion | bidrag) |
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(17 mellanliggande versioner visas inte.) | |||
Rad 1: | Rad 1: | ||
+ | |||
==Övning 4.3:1== | ==Övning 4.3:1== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | Bestäm de vinklar $v$ mellan $\displaystyle \frac{\pi}{2}$ och $2\pi$ som uppfyller | + | Bestäm de vinklar $\,v\,$ mellan $\,\displaystyle \frac{\pi}{2}\,$ och $\,2\pi\,$ som uppfyller |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\cos{v}=\cos{\displaystyle \frac{\pi}{5}}$</td> | + | <td class="ntext" width="33%">$\cos{v}=\cos{\displaystyle \frac{\pi}{5}}$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\sin{v}=\sin{\displaystyle \frac{\pi}{7}}$</td> | + | <td class="ntext" width="33%">$\sin{v}=\sin{\displaystyle \frac{\pi}{7}}$</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | <td class="ntext">c)</td> |
- | <td class="ntext">$\tan{v}=\tan{\displaystyle \frac{2\pi}{7}}$</td> | + | <td class="ntext" width="33%">$\tan{v}=\tan{\displaystyle \frac{2\pi}{7}}$</td> |
</tr> | </tr> | ||
</table> | </table> | ||
Rad 17: | Rad 18: | ||
<div class=NavHead>Facit </div> | <div class=NavHead>Facit </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Facit till alla delfrågor |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$v = \displaystyle \frac{9\pi}{5}$</td> | + | <td class="ntext" width="33%">$v = \displaystyle \frac{9\pi}{5}$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$v = \displaystyle \frac{6\pi}{7}$</td> | + | <td class="ntext" width="33%">$v = \displaystyle \frac{6\pi}{7}$</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | <td class="ntext">c)</td> |
- | <td class="ntext">$v = \displaystyle \frac{9\pi}{7}$</td> | + | <td class="ntext" width="33%">$v = \displaystyle \frac{9\pi}{7}$</td> |
</tr> | </tr> | ||
</table> | </table> | ||
Rad 32: | Rad 33: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_1a.gif]] | + | Lösning till delfråga a) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_1a.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </DIV> | + | <div class=NavHead>Lösning b) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_1b.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_1b.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning c </div> | + | <div class=NavHead>Lösning c) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga c<br />[[Bild:4_3_1c.gif]] | + | Lösning till delfråga c) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_1c.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 54: | Rad 76: | ||
==Övning 4.3:2== | ==Övning 4.3:2== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | Bestäm de vinklar $v$ mellan 0 och $\pi$ som uppfyller | + | Bestäm de vinklar $\,v\,$ mellan 0 och $\,\pi\,$ som uppfyller |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\cos{v} = \cos{\displaystyle \frac{3\pi}{2}}$</td> | + | <td class="ntext" width="50%">$\cos{v} = \cos{\displaystyle \frac{3\pi}{2}}$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\cos{v} = \cos{ \displaystyle \frac{7\pi}{5}}$</td> | + | <td class="ntext" width="50%">$\cos{v} = \cos{ \displaystyle \frac{7\pi}{5}}$</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 69: | Rad 91: | ||
<div class=NavHead>Facit </div> | <div class=NavHead>Facit </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Facit till alla delfrågor |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$v=\displaystyle \frac{\pi}{2}$</td> | + | <td class="ntext" width="50%">$v=\displaystyle \frac{\pi}{2}$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$v=\displaystyle \frac{3\pi}{5}$</td> | + | <td class="ntext" width="50%">$v=\displaystyle \frac{3\pi}{5}$</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 83: | Rad 105: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_2a.gif]] | + | Lösning till delfråga a) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_2a.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </DIV> | + | <div class=NavHead>Lösning b) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_2b.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_2b.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 98: | Rad 134: | ||
==Övning 4.3:3== | ==Övning 4.3:3== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | Antag att $-\displaystyle \frac{\pi}{2} \leq v \leq \displaystyle \frac{\pi}{2}$ och att $\sin{v} = a$. Uttryck med hjälp av $a$ | + | Antag att $\,-\displaystyle \frac{\pi}{2} \leq v \leq \displaystyle \frac{\pi}{2}\,$ och att $\,\sin{v} = a\,$. Uttryck med hjälp av $\,a$ |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\sin{(-v)}$</td> | + | <td class="ntext" width="50%">$\sin{(-v)}$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\sin{(\pi-v)}$</td> | + | <td class="ntext" width="50%">$\sin{(\pi-v)}$</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | </tr> |
- | <td class="ntext">$\cos{v}$</td> | + | <tr align="left"> |
+ | <td class="ntext">c)</td> | ||
+ | <td class="ntext" width="50%">$\cos{v}$</td> | ||
+ | <td class="ntext">d)</td> | ||
+ | <td class="ntext" width="50%">$\sin{\left(\displaystyle \frac{\pi}{2}-v\right)}$</td> | ||
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{d) }$</td> | + | <td class="ntext">e)</td> |
- | <td class="ntext">$\sin{\left(\displaystyle \frac{\pi}{2}-v\right)}$</td> | + | <td class="ntext" width="50%">$\cos{\left( \displaystyle \frac{\pi}{2} + v\right)}$</td> |
- | <td class="ntext">$\textrm{e) }$</td> | + | <td class="ntext">f)</td> |
- | <td class="ntext">$\cos{\left( \displaystyle \frac{\pi}{2} + v\right)}$</td> | + | <td class="ntext" width="50%">$\sin{\left( \displaystyle \frac{\pi}{3} + v \right)}$</td> |
- | <td class="ntext">$\textrm{f) }$</td> | + | |
- | <td class="ntext">$\sin{\left( \displaystyle \frac{\pi}{3} + v \right)}$</td> | + | |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 124: | Rad 161: | ||
<div class=NavHead>Facit </div> | <div class=NavHead>Facit </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Facit till alla delfrågor |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$-a$</td> | + | <td class="ntext" width="50%">$-a$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$a$</td> | + | <td class="ntext" width="50%">$a$</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | </tr> |
- | <td class="ntext">$\sqrt{1-a^2}$</td> | + | <tr align="left"> |
+ | <td class="ntext">c)</td> | ||
+ | <td class="ntext" width="50%">$\sqrt{1-a^2}$</td> | ||
+ | <td class="ntext">d)</td> | ||
+ | <td class="ntext" width="50%">$\sqrt{1-a^2}$</td> | ||
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{d) }$</td> | + | <td class="ntext">e)</td> |
- | <td class="ntext">$\sqrt{1-a^2}$</td> | + | <td class="ntext" width="50%">$-a$</td> |
- | <td class="ntext">$\textrm{e) }$</td> | + | <td class="ntext">f)</td> |
- | <td class="ntext">$-a$</td> | + | <td class="ntext" width="50%">$\displaystyle \frac{\sqrt{3}}{2}\sqrt{1-a^2}+\displaystyle \frac{1}{2}\cdot a $</td> |
- | <td class="ntext">$\textrm{f) }$</td> | + | |
- | <td class="ntext">$\displaystyle \frac{\sqrt{3}}{2}\sqrt{1-a^2}+\displaystyle \frac{1}{2}\cdot a $</td> | + | |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 149: | Rad 187: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_3a.gif]] | + | Lösning till delfråga a) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_3a.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </DIV> | + | <div class=NavHead>Lösning b) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_3b.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_3b.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 164: | Rad 216: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning c </div> | + | <div class=NavHead>Lösning c) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga c<br />[[Bild:4_3_3c.gif]] | + | Lösning till delfråga c) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_3c.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning d </DIV> | + | <div class=NavHead>Lösning d) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga d<br />[[Bild:4_3_3d.gif]] | + | Lösning till delfråga d) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_3d.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 179: | Rad 245: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning e </div> | + | <div class=NavHead>Lösning e) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga e<br />[[Bild:4_3_3e.gif]] | + | Lösning till delfråga e) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_3e.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning f </DIV> | + | <div class=NavHead>Lösning f) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga f<br />[[Bild:4_3_3f.gif]] | + | Lösning till delfråga f) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_3f.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 194: | Rad 274: | ||
==Övning 4.3:4== | ==Övning 4.3:4== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | Antag att $0 \leq v \leq \pi$ och att $\cos{v}=b$. Uttryck med hjälp av $b$ | + | Antag att $\,0 \leq v \leq \pi\,$ och att $\,\cos{v}=b\,$. Uttryck med hjälp av $\,b\,$ |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\sin^2{v}$</td> | + | <td class="ntext" width="50%">$\sin^2{v}$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\sin{v}$</td> | + | <td class="ntext" width="50%">$\sin{v}$</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | </tr> |
- | <td class="ntext">$\sin{2v}$</td> | + | <tr align="left"> |
+ | <td class="ntext">c)</td> | ||
+ | <td class="ntext" width="50%">$\sin{2v}$</td> | ||
+ | <td class="ntext">d)</td> | ||
+ | <td class="ntext" width="50%">$\cos{2v}$</td> | ||
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{d) }$</td> | + | <td class="ntext">e)</td> |
- | <td class="ntext">$\cos{2v}$</td> | + | <td class="ntext" width="50%">$\sin{\left( v+\displaystyle \frac{\pi}{4} \right)}$</td> |
- | <td class="ntext">$\textrm{e) }$</td> | + | <td class="ntext">f)</td> |
- | <td class="ntext">$\sin{\left( v+\displaystyle \frac{\pi}{4} \right)}$</td> | + | <td class="ntext" width="50%">$\cos{\left( v-\displaystyle \frac{\pi}{3} \right)}$</td> |
- | <td class="ntext">$\textrm{f) }$</td> | + | |
- | <td class="ntext">$\cos{\left( v-\displaystyle \frac{\pi}{3} \right)}$</td> | + | |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 220: | Rad 301: | ||
<div class=NavHead>Facit </div> | <div class=NavHead>Facit </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Facit till alla delfrågor |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$1-b^2$</td> | + | <td class="ntext" width="50%">$1-b^2$</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\sqrt{1-b^2}$</td> | + | <td class="ntext" width="50%">$\sqrt{1-b^2}$</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | </tr> |
- | <td class="ntext">$2b\sqrt{1-b^2}$</td> | + | <tr align="left"> |
+ | <td class="ntext">c)</td> | ||
+ | <td class="ntext" width="50%">$2b\sqrt{1-b^2}$</td> | ||
+ | <td class="ntext">d)</td> | ||
+ | <td class="ntext" width="50%">$2b^2-1$</td> | ||
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{d) }$</td> | + | <td class="ntext">e)</td> |
- | <td class="ntext">$2b^2-1$</td> | + | <td class="ntext" width="50%">$\sqrt{1-b^2}\cdot\displaystyle \frac{1}{\sqrt{2}} + b\cdot \displaystyle \frac{1}{\sqrt{2}} $</td> |
- | <td class="ntext">$\textrm{e) }$</td> | + | <td class="ntext">f)</td> |
- | <td class="ntext">$\sqrt{1-b^2}\cdot\displaystyle \frac{1}{\sqrt{2}} + b\cdot \displaystyle \frac{1}{\sqrt{2}} $</td> | + | <td class="ntext" width="50%">$b\cdot\displaystyle \frac{1}{2}+\sqrt{1-b^2}\cdot\displaystyle \frac{\sqrt{3}}{2}$</td> |
- | <td class="ntext">$\textrm{f) }$</td> | + | |
- | <td class="ntext">$b\cdot\displaystyle \frac{1}{2}+\sqrt{1-b^2}\cdot\displaystyle \frac{\sqrt{3}}{2}$</td> | + | |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 245: | Rad 327: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_4a.gif]] | + | Lösning till delfråga a) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_4a.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </DIV> | + | <div class=NavHead>Lösning b) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_4b.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_4b.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 260: | Rad 356: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning c </div> | + | <div class=NavHead>Lösning c) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga c<br />[[Bild:4_3_4c.gif]] | + | Lösning till delfråga c) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_4c.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning d </DIV> | + | <div class=NavHead>Lösning d) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga d<br />[[Bild:4_3_4d.gif]] | + | Lösning till delfråga d) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_4d.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 275: | Rad 385: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning e </div> | + | <div class=NavHead>Lösning e) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga e<br />[[Bild:4_3_4e.gif]] | + | Lösning till delfråga e) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_4e.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning f </DIV> | + | <div class=NavHead>Lösning f) </DIV> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga f<br />[[Bild:4_3_4f.gif]] | + | Lösning till delfråga f) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_4f.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 290: | Rad 414: | ||
==Övning 4.3:5== | ==Övning 4.3:5== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | För en spetsig vinkel $v$ i en triangel gäller att $\sin{v}=\displaystyle \frac{5}{7}$. Bestäm $\cos{v}$ och $\tan{v}$. | + | För en spetsig vinkel $\,v\,$ i en triangel gäller att $\,\sin{v}=\displaystyle \frac{5}{7}\,$. Bestäm $\,\cos{v}\,$ och $\,\tan{v}\,$. |
</div> | </div> | ||
Rad 298: | Rad 422: | ||
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\cos{v}=\displaystyle \frac{2\sqrt{6}}{7}$</td> | + | <td class="ntext" width="100%">$\cos{v}=\displaystyle \frac{2\sqrt{6}}{7}\quad$ och $\quad\tan{v}=\displaystyle \frac{5}{2\sqrt{6}}\,$.</td> |
- | <td class="ntext">$\tan{v}=\displaystyle \frac{5}{2\sqrt{6}}$</td> | + | |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 309: | Rad 432: | ||
<div class=NavHead>Lösning </div> | <div class=NavHead>Lösning </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | [[Bild:4_3_5-1(2).gif]]<br\>[[Bild:4_3_5-2(2).gif]] | + | <table width="100%"> |
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_5-1(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_5-2(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 316: | Rad 450: | ||
<div class="ovning"> | <div class="ovning"> | ||
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
- | <tr align="left"> | + | <tr align="left" valign="top"> |
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">Bestäm $\sin{v}$ och $\tan{v}$ om $\cos{v}=\displaystyle \frac{3}{4}$ och $\displaystyle \frac{3\pi}{2} \leq v \leq 2\pi$.</td> | + | <td class="ntext" width="100%">Bestäm $\ \sin{v}\ $ och $\ \tan{v}\ $ om $\ \cos{v}=\displaystyle \frac{3}{4}\ $ och $\ \displaystyle \frac{3\pi}{2} \leq v \leq 2\pi\,$.</td> |
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | + | <tr align="left" valign="top"> |
- | <tr align="left"> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext" width="100%">Bestäm $\ \cos{v}\ $ och $\ \tan{v}\ $ om $\ \sin{v}=\displaystyle \frac{3}{10}\ $ och $\,v\,$ ligger i den andra kvadranten.</td> |
- | <td class="ntext">Bestäm $\cos{v}$ och $\tan{v}$ om $\sin{v}=\displaystyle \frac{3}{10}$ och $v$ ligger i den andra kvadranten.</td> | + | |
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | + | <tr align="left" valign="top"> |
- | <tr align="left"> | + | <td class="ntext">c)</td> |
- | <td class="ntext">$\textrm{c) }$</td> | + | <td class="ntext" width="100%">Bestäm $\ \sin{v}\ $ och $\ \cos{v}\ $ om $\ \tan{v}=3\ $ och $\ \pi \leq v \leq \displaystyle \frac{3\pi}{2}\,$.</td> |
- | <td class="ntext">Bestäm $\sin{v}$ och $\cos{v}$ om $\tan{v}=3$ och $\pi \leq v \leq \displaystyle \frac{3\pi}{2}$</td> | + | |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 337: | Rad 469: | ||
<div class=NavHead>Facit </div> | <div class=NavHead>Facit </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Facit till alla delfrågor |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\sin{v}=-\displaystyle \frac{\sqrt{7}}{4}$ och $\tan{v}=-\displaystyle \frac{\sqrt{7}}{3}$</td> | + | <td class="ntext" width="100%">$\sin{v}=-\displaystyle \frac{\sqrt{7}}{4}\quad$ och $\quad\tan{v}=-\displaystyle \frac{\sqrt{7}}{3}\,$.</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\cos{v}=-\displaystyle \frac{\sqrt{91}}{10}$ och $\tan{v}=-\displaystyle \frac{3}{\sqrt{91}}$</td> | + | <td class="ntext" width="100%">$\cos{v}=-\displaystyle \frac{\sqrt{91}}{10}\quad$ och $\quad\tan{v}=-\displaystyle \frac{3}{\sqrt{91}}\,$.</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{c) }$</td> | + | <td class="ntext">c)</td> |
- | <td class="ntext">$\sin{v}=-\displaystyle \frac{3}{\sqrt{10}}$ och $\cos{v}=-\displaystyle \frac{1}{\sqrt{10}}$</td> | + | <td class="ntext" width="50%">$\sin{v}=-\displaystyle \frac{3}{\sqrt{10}}\quad$ och $\quad\cos{v}=-\displaystyle \frac{1}{\sqrt{10}}\,$.</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 359: | Rad 491: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_6a.gif]] | + | Lösning till delfråga a) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_6a-1(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_6a-2(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </div> | + | <div class=NavHead>Lösning b) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_6b.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_6b-1(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_6b-2(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning c </div> | + | <div class=NavHead>Lösning c) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga c<br />[[Bild:4_3_6c.gif]] | + | Lösning till delfråga c) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_6c-1(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_6c-2(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 381: | Rad 549: | ||
==Övning 4.3:7== | ==Övning 4.3:7== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | Bestäm $\sin{(x+y)}$ om | + | Bestäm $\ \sin{(x+y)}\ $ om |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\sin{x}=\displaystyle \frac{2}{3}, \sin{y}=\displaystyle \frac{1}{3}$ och $x,y$ är vinklar i första kvadranten.</td> | + | <td class="ntext" width="100%">$\sin{x}=\displaystyle \frac{2}{3}\,$, $\ \sin{y}=\displaystyle \frac{1}{3}\ $ och $\,x\,$, $\,y\,$ är vinklar i första kvadranten.</td> |
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\cos{x}=\displaystyle \frac{2}{5}, \cos{y}=\displaystyle \frac{3}{5}$ och $x,y$ är vinklar i första kvadranten.</td> | + | <td class="ntext" width="100%">$\cos{x}=\displaystyle \frac{2}{5}\,$, $\ \cos{y}=\displaystyle \frac{3}{5}\ $ och $\,x\,$, $\,y\,$ är vinklar i första kvadranten.</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 399: | Rad 566: | ||
<div class=NavHead>Facit </div> | <div class=NavHead>Facit </div> | ||
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Facit till alla delfrågor |
<table width="100%" cellspacing="10px"> | <table width="100%" cellspacing="10px"> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext">$\sin{(x+y)}=\displaystyle \frac{4\sqrt{2}+\sqrt{5}}{9}$</td> | + | <td class="ntext" width="100%">$\sin{(x+y)}=\displaystyle \frac{4\sqrt{2}+\sqrt{5}}{9}$</td> |
</tr> | </tr> | ||
- | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
- | <td class="ntext">$\sin{(x+y)}=\displaystyle \frac{3\sqrt{21}+8}{25}$</td> | + | <td class="ntext" width="100%">$\sin{(x+y)}=\displaystyle \frac{3\sqrt{21}+8}{25}$</td> |
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
Rad 416: | Rad 582: | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_7a.gif]] | + | Lösning till delfråga a) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_7a.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </div> | + | <div class=NavHead>Lösning b) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_7b.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_7b.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
Rad 431: | Rad 611: | ||
==Övning 4.3:8== | ==Övning 4.3:8== | ||
<div class="ovning"> | <div class="ovning"> | ||
- | + | Visa följande trigonometriska samband | |
+ | <table width="100%" cellspacing="10px"> | ||
+ | <tr align="left"> | ||
+ | <td class="ntext>a)</td> | ||
+ | <td class="ntext width="100%">$\tan^2v=\displaystyle\frac{\sin^2v}{1-\sin^2v}$</td> | ||
+ | </tr> | ||
+ | <tr align="left"> | ||
+ | <td class="ntext>b)</td> | ||
+ | <td class="ntext width="100%">$\displaystyle \frac{1}{\cos v}-\tan v=\frac{\cos v}{1+\sin v}$</td> | ||
+ | </tr> | ||
+ | <tr align="left"> | ||
+ | <td class="ntext>c)</td> | ||
+ | <td class="ntext width="100%">$\tan\displaystyle\frac{u}{2}=\frac{\sin u}{1+\cos u}$</td> | ||
+ | </tr> | ||
+ | <tr align="left"> | ||
+ | <td class="ntext>d)</td> | ||
+ | <td class="ntext width="100%">$\displaystyle\frac{\cos (u+v)}{\cos u \cos v}= 1- \tan u \tan v$</td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Facit </div> | + | <div class=NavHead>Lösning a) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Lösning till delfråga a) |
- | + | <table width="100%"> | |
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_8a.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning a </div> | + | <div class=NavHead>Lösning b) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga a<br />[[Bild:4_3_8a.gif]] | + | Lösning till delfråga b) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_8b.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </div> | + | <div class=NavHead>Lösning c) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_8b.gif]] | + | Lösning till delfråga c) |
+ | <table width="100%"> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_8c-1(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_8c-2(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
- | </div> | ||
- | |||
- | ==Övning 4.3:9== | ||
- | <div class="ovning"> | ||
- | |||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Facit </div> | + | <div class=NavHead>Lösning d) </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Facit till alla delfrågorna<br \> | + | Lösning till delfråga a) |
- | + | <table width="100%"> | |
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_8d.gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> | ||
- | <div class=NavFrame style="CLEAR: both"> | + | ==Övning 4.3:9== |
- | <div class=NavHead>Lösning a </div> | + | <div class="ovning"> |
- | <div class=NavContent> | + | <table width="100%" cellspacing="10px"> |
- | Lösning till delfråga a<br />[[Bild:4_3_9a.gif]] | + | <tr align="left"> |
- | </div> | + | <td class="ntext> |
+ | Visa "Feynmans likhet" | ||
+ | $$\cos 20^\circ \cdot \cos 40^\circ \cdot \cos 80^\circ = \displaystyle\frac{1}{8}\,\mbox{.}$$ | ||
+ | (Ledtråd: Använd formeln för dubbla vinkeln på $\,\sin 160^\circ\,$.) | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
<div class=NavFrame style="CLEAR: both"> | <div class=NavFrame style="CLEAR: both"> | ||
- | <div class=NavHead>Lösning b </div> | + | <div class=NavHead>Lösning </div> |
<div class=NavContent> | <div class=NavContent> | ||
- | Lösning till delfråga b<br />[[Bild:4_3_9b.gif]] | + | <table width="100%"> |
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_9-1(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | <tr> | ||
+ | <td align="center"> | ||
+ | [[Bild:4_3_9-2(2).gif]] | ||
+ | </td> | ||
+ | </tr> | ||
+ | </table> | ||
</div> | </div> | ||
</div> | </div> |
Nuvarande version
Innehåll |
[redigera] Övning 4.3:1
Bestäm de vinklar $\,v\,$ mellan $\,\displaystyle \frac{\pi}{2}\,$ och $\,2\pi\,$ som uppfyller
a) | $\cos{v}=\cos{\displaystyle \frac{\pi}{5}}$ | b) | $\sin{v}=\sin{\displaystyle \frac{\pi}{7}}$ | c) | $\tan{v}=\tan{\displaystyle \frac{2\pi}{7}}$ |
Facit till alla delfrågor
a) | $v = \displaystyle \frac{9\pi}{5}$ | b) | $v = \displaystyle \frac{6\pi}{7}$ | c) | $v = \displaystyle \frac{9\pi}{7}$ |
[redigera] Övning 4.3:2
Bestäm de vinklar $\,v\,$ mellan 0 och $\,\pi\,$ som uppfyller
a) | $\cos{v} = \cos{\displaystyle \frac{3\pi}{2}}$ | b) | $\cos{v} = \cos{ \displaystyle \frac{7\pi}{5}}$ |
Facit till alla delfrågor
a) | $v=\displaystyle \frac{\pi}{2}$ | b) | $v=\displaystyle \frac{3\pi}{5}$ |
[redigera] Övning 4.3:3
Antag att $\,-\displaystyle \frac{\pi}{2} \leq v \leq \displaystyle \frac{\pi}{2}\,$ och att $\,\sin{v} = a\,$. Uttryck med hjälp av $\,a$
a) | $\sin{(-v)}$ | b) | $\sin{(\pi-v)}$ |
c) | $\cos{v}$ | d) | $\sin{\left(\displaystyle \frac{\pi}{2}-v\right)}$ |
e) | $\cos{\left( \displaystyle \frac{\pi}{2} + v\right)}$ | f) | $\sin{\left( \displaystyle \frac{\pi}{3} + v \right)}$ |
Facit till alla delfrågor
a) | $-a$ | b) | $a$ |
c) | $\sqrt{1-a^2}$ | d) | $\sqrt{1-a^2}$ |
e) | $-a$ | f) | $\displaystyle \frac{\sqrt{3}}{2}\sqrt{1-a^2}+\displaystyle \frac{1}{2}\cdot a $ |
[redigera] Övning 4.3:4
Antag att $\,0 \leq v \leq \pi\,$ och att $\,\cos{v}=b\,$. Uttryck med hjälp av $\,b\,$
a) | $\sin^2{v}$ | b) | $\sin{v}$ |
c) | $\sin{2v}$ | d) | $\cos{2v}$ |
e) | $\sin{\left( v+\displaystyle \frac{\pi}{4} \right)}$ | f) | $\cos{\left( v-\displaystyle \frac{\pi}{3} \right)}$ |
Facit till alla delfrågor
a) | $1-b^2$ | b) | $\sqrt{1-b^2}$ |
c) | $2b\sqrt{1-b^2}$ | d) | $2b^2-1$ |
e) | $\sqrt{1-b^2}\cdot\displaystyle \frac{1}{\sqrt{2}} + b\cdot \displaystyle \frac{1}{\sqrt{2}} $ | f) | $b\cdot\displaystyle \frac{1}{2}+\sqrt{1-b^2}\cdot\displaystyle \frac{\sqrt{3}}{2}$ |
[redigera] Övning 4.3:5
För en spetsig vinkel $\,v\,$ i en triangel gäller att $\,\sin{v}=\displaystyle \frac{5}{7}\,$. Bestäm $\,\cos{v}\,$ och $\,\tan{v}\,$.
$\cos{v}=\displaystyle \frac{2\sqrt{6}}{7}\quad$ och $\quad\tan{v}=\displaystyle \frac{5}{2\sqrt{6}}\,$. |
[redigera] Övning 4.3:6
a) | Bestäm $\ \sin{v}\ $ och $\ \tan{v}\ $ om $\ \cos{v}=\displaystyle \frac{3}{4}\ $ och $\ \displaystyle \frac{3\pi}{2} \leq v \leq 2\pi\,$. |
b) | Bestäm $\ \cos{v}\ $ och $\ \tan{v}\ $ om $\ \sin{v}=\displaystyle \frac{3}{10}\ $ och $\,v\,$ ligger i den andra kvadranten. |
c) | Bestäm $\ \sin{v}\ $ och $\ \cos{v}\ $ om $\ \tan{v}=3\ $ och $\ \pi \leq v \leq \displaystyle \frac{3\pi}{2}\,$. |
Facit till alla delfrågor
a) | $\sin{v}=-\displaystyle \frac{\sqrt{7}}{4}\quad$ och $\quad\tan{v}=-\displaystyle \frac{\sqrt{7}}{3}\,$. |
b) | $\cos{v}=-\displaystyle \frac{\sqrt{91}}{10}\quad$ och $\quad\tan{v}=-\displaystyle \frac{3}{\sqrt{91}}\,$. |
c) | $\sin{v}=-\displaystyle \frac{3}{\sqrt{10}}\quad$ och $\quad\cos{v}=-\displaystyle \frac{1}{\sqrt{10}}\,$. |
[redigera] Övning 4.3:7
Bestäm $\ \sin{(x+y)}\ $ om
a) | $\sin{x}=\displaystyle \frac{2}{3}\,$, $\ \sin{y}=\displaystyle \frac{1}{3}\ $ och $\,x\,$, $\,y\,$ är vinklar i första kvadranten. |
b) | $\cos{x}=\displaystyle \frac{2}{5}\,$, $\ \cos{y}=\displaystyle \frac{3}{5}\ $ och $\,x\,$, $\,y\,$ är vinklar i första kvadranten. |
Facit till alla delfrågor
a) | $\sin{(x+y)}=\displaystyle \frac{4\sqrt{2}+\sqrt{5}}{9}$ |
b) | $\sin{(x+y)}=\displaystyle \frac{3\sqrt{21}+8}{25}$ |
[redigera] Övning 4.3:8
Visa följande trigonometriska samband
a) | $\tan^2v=\displaystyle\frac{\sin^2v}{1-\sin^2v}$ |
b) | $\displaystyle \frac{1}{\cos v}-\tan v=\frac{\cos v}{1+\sin v}$ |
c) | $\tan\displaystyle\frac{u}{2}=\frac{\sin u}{1+\cos u}$ |
d) | $\displaystyle\frac{\cos (u+v)}{\cos u \cos v}= 1- \tan u \tan v$ |
[redigera] Övning 4.3:9
Visa "Feynmans likhet" $$\cos 20^\circ \cdot \cos 40^\circ \cdot \cos 80^\circ = \displaystyle\frac{1}{8}\,\mbox{.}$$ (Ledtråd: Använd formeln för dubbla vinkeln på $\,\sin 160^\circ\,$.) |