Versionen från 25 juni 2007 kl. 08.18 (redigera) KTH.SE:u1xsetv1 (Diskussion | bidrag) ← Gå till föregående ändring |
Nuvarande version (30 juni 2007 kl. 15.48) (redigera) (ogör) KTH.SE:u1m1gion (Diskussion | bidrag) |
(20 mellanliggande versioner visas inte.) |
Rad 187: |
Rad 187: |
| </div> | | </div> |
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- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Facit </div> | + | |
- | <div class=NavContent> | + | |
- | Facit till alla delfrågor<br \> | + | |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
| <td class="ntext">a)</td> | | <td class="ntext">a)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">En cirkel med radie 3 och medelpunkt i origo.</td> |
| <td class="ntext">b)</td> | | <td class="ntext">b)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">En cirkel med radie $\sqrt 3$ och medelpunkt i punkten (1, 2).</td> |
| </tr> | | </tr> |
| <tr align="left"> | | <tr align="left"> |
| <td class="ntext">c)</td> | | <td class="ntext">c)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">En cirkel med radie $\frac{1}{3}\sqrt 10$ och medelpunkt i punkten (1/3, -7/3).</td> |
| </tr> | | </tr> |
| <tr><td height="5px"/></tr> | | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning a) </div> | |
- | <div class=NavContent> | |
- | Lösning till delfråga a) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_6a.gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | | |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning b) </DIV> | |
- | <div class=NavContent> | |
- | Lösning till delfråga b) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_6b.gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning c) </DIV> | |
- | <div class=NavContent> | |
- | Lösning till delfråga c) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_6c-1(2).gif]] | |
- | </td> | |
- | </tr> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_6c-2(2).gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | </div> | |
| </div> | | </div> |
| | | |
Rad 275: |
Rad 223: |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Facit </div> | + | |
- | <div class=NavContent> | + | |
- | Facit till alla delfrågor<br \> | + | |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
| <td class="ntext">a)</td> | | <td class="ntext">a)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">En cirkel med medelpunkt (-1, 1) och radie $\sqrt 3$.</td> |
| <td class="ntext">b)</td> | | <td class="ntext">b)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">En cirkel med medelpunkt (0, -2) och radie 2. </td> |
| </tr> | | </tr> |
| <tr align="left"> | | <tr align="left"> |
| <td class="ntext">c)</td> | | <td class="ntext">c)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">En cirkel med medelpunkt (1, -3) och radie $\sqrt 7$.</td> |
| + | </tr> |
| + | <tr align="left"> |
| <td class="ntext">d)</td> | | <td class="ntext">d)</td> |
- | <td class="ntext" width="50%">BILD</td> | + | <td class="ntext" width="50%">Endast punkten (1, -1). </td> |
| </tr> | | </tr> |
| + | |
| <tr><td height="5px"/></tr> | | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning a) </div> | |
- | <div class=NavContent> | |
- | Lösning till delfråga a) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_7a-1(2).gif]] | |
- | </td> | |
- | </tr> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_7a-2(2).gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | | |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning b) </DIV> | |
- | <div class=NavContent> | |
- | Lösning till delfråga b) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_7b.gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning c) </DIV> | |
- | <div class=NavContent> | |
- | Lösning till delfråga c) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_7c.gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | </div> | |
- | </div> | |
- | | |
- | <div class=NavFrame style="CLEAR: both"> | |
- | <div class=NavHead>Lösning d) </DIV> | |
- | <div class=NavContent> | |
- | Lösning till delfråga d) | |
- | <table width="100%"> | |
- | <tr> | |
- | <td align="center"> | |
- | [[Bild:4_1_7d.gif]] | |
- | </td> | |
- | </tr> | |
- | </table> | |
- | </div> | |
| </div> | | </div> |
| | | |
Rad 397: |
Rad 282: |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr><td height="5px"/></tr> | | <tr><td height="5px"/></tr> |
- | <tr align="center"> | + | <tr> |
- | <td class="ntext" width="100%">BILD</td> | + | <td align="center"> |
- | </tr> | + | [[Bild:Uppg_4_1_10.gif]] |
- | <tr><td height="5px"/></tr> | + | </td> |
| + | </tr><tr><td height="5px"/></tr> |
| </table> | | </table> |
| + | |
| | | |
| </div> | | </div> |
Rad 911: |
Rad 798: |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Facit </div> | + | |
- | <div class=NavContent> | + | |
- | Facit till alla delfrågor | + | |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
Rad 933: |
Rad 817: |
| </table> | | </table> |
| </div> | | </div> |
| + | |
| + | ==Övning 4.3:7== |
| + | <div class="ovning"> |
| + | Bestäm $\ \sin{(x+y)}\ $ om |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</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 align="left"> |
| + | <td class="ntext">b)</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><td height="5px"/></tr> |
| + | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Lösning a) </div> | + | <table width="100%" cellspacing="10px"> |
- | <div class=NavContent> | + | <tr align="left"> |
- | Lösning till delfråga a) | + | <td class="ntext">a)</td> |
- | <table width="100%"> | + | <td class="ntext" width="100%">$\sin{(x+y)}=\displaystyle \frac{4\sqrt{2}+\sqrt{5}}{9}$</td> |
- | <tr> | + | |
- | <td align="center"> | + | |
- | [[Bild:4_3_6a-1(2).gif]] | + | |
- | </td> | + | |
| </tr> | | </tr> |
- | <tr> | + | <tr align="left"> |
- | <td align="center"> | + | <td class="ntext">b)</td> |
- | [[Bild:4_3_6a-2(2).gif]] | + | <td class="ntext" width="100%">$\sin{(x+y)}=\displaystyle \frac{3\sqrt{21}+8}{25}$</td> |
- | </td> | + | |
| </tr> | | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | ==Övning 4.3:8== |
- | <div class=NavHead>Lösning b) </div> | + | <div class="ovning"> |
- | <div class=NavContent> | + | Visa följande trigonometriska samband |
- | Lösning till delfråga b) | + | <table width="100%" cellspacing="10px"> |
- | <table width="100%"> | + | <tr align="left"> |
- | <tr> | + | <td class="ntext>a)</td> |
- | <td align="center"> | + | <td class="ntext width="100%">$\tan^2v=\displaystyle\frac{\sin^2v}{1-\sin^2v}$</td> |
- | [[Bild:4_3_6b-1(2).gif]] | + | |
- | </td> | + | |
| </tr> | | </tr> |
- | <tr> | + | <tr align="left"> |
- | <td align="center"> | + | <td class="ntext>b)</td> |
- | [[Bild:4_3_6b-2(2).gif]] | + | <td class="ntext width="100%">$\displaystyle \frac{1}{\cos v}-\tan v=\frac{\cos v}{1+\sin v}$</td> |
- | </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> | | </tr> |
| </table> | | </table> |
| </div> | | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">Se lösningen i webmaterialet när |
| + | du loggat in till kursen</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | ==Övning 4.3:9== |
- | <div class=NavHead>Lösning c) </div> | + | <div class="ovning"> |
- | <div class=NavContent> | + | <table width="100%" cellspacing="10px"> |
- | Lösning till delfråga c) | + | <tr align="left"> |
- | <table width="100%"> | + | <td class="ntext> |
- | <tr> | + | Visa "Feynmans likhet" |
- | <td align="center"> | + | $$\cos 20^\circ \cdot \cos 40^\circ \cdot \cos 80^\circ = \displaystyle\frac{1}{8}\,\mbox{.}$$ |
- | [[Bild:4_3_6c-1(2).gif]] | + | (Ledtråd: Använd formeln för dubbla vinkeln på $\,\sin 160^\circ\,$.) |
| </td> | | </td> |
| </tr> | | </tr> |
- | <tr> | + | </table> |
- | <td align="center"> | + | </div> |
- | [[Bild:4_3_6c-2(2).gif]] | + | |
- | </td> | + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">Se lösningen i webmaterialet när |
| + | du loggat in till kursen</td> |
| </tr> | | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |
| | | |
- | ==Övning 4.3:7== | + | ==Övning 4.4:1== |
| <div class="ovning"> | | <div class="ovning"> |
- | Bestäm $\ \sin{(x+y)}\ $ om | + | För vilka vinklar $\,v\,$, där $\,0 \leq v\leq 2\pi\,$, gäller att |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
| <td class="ntext">a)</td> | | <td class="ntext">a)</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> | + | <td class="ntext" width="50%">$\sin{v}=\displaystyle \frac{1}{2}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\cos{v}=\displaystyle \frac{1}{2}$</td> |
| </tr> | | </tr> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext">b)</td> | + | <td class="ntext">c)</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> | + | <td class="ntext" width="50%">$\sin{v}=1$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$\tan{v}=1$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">$\cos{v}=2$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">$\sin{v}=-\displaystyle \frac{1}{2}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">g)</td> |
| + | <td class="ntext" width="50%">$\tan{v}=-\displaystyle \frac{1}{\sqrt{3}}$</td> |
| </tr> | | </tr> |
| <tr><td height="5px"/></tr> | | <tr><td height="5px"/></tr> |
Rad 1 008: |
Rad 934: |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Facit </div> | + | |
- | <div class=NavContent> | + | |
- | Facit till alla delfrågor | + | |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
| <td class="ntext">a)</td> | | <td class="ntext">a)</td> |
- | <td class="ntext" width="100%">$\sin{(x+y)}=\displaystyle \frac{4\sqrt{2}+\sqrt{5}}{9}$</td> | + | <td class="ntext" width="50%">$\displaystyle v=\frac{\pi}{6}\,$, $\,\displaystyle v=\frac{5\pi}{6}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\displaystyle v=\frac{\pi}{3}\,$, $\,\displaystyle v=\frac{5\pi}{3}$</td> |
| </tr> | | </tr> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext">b)</td> | + | <td class="ntext">c)</td> |
- | <td class="ntext" width="100%">$\sin{(x+y)}=\displaystyle \frac{3\sqrt{21}+8}{25}$</td> | + | <td class="ntext" width="50%">$\displaystyle v=\frac{\pi}{2}$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$\displaystyle v=\frac{\pi}{4}\,$, $\,\displaystyle v=\frac{5\pi}{4}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">lösning saknas</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">$\displaystyle v=\frac{11\pi}{6}\,$, $\,\displaystyle v=\frac{7\pi}{6}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">g)</td> |
| + | <td class="ntext" width="50%">$\displaystyle v=\frac{5\pi}{6}\,$, $\,\displaystyle v=\frac{11\pi}{6}$</td> |
| </tr> | | </tr> |
| <tr><td height="5px"/></tr> | | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | ==Övning 4.4:2== |
- | <div class=NavHead>Lösning a) </div> | + | <div class="ovning"> |
- | <div class=NavContent> | + | Lös ekvationen |
- | Lösning till delfråga a) | + | <table width="100%" cellspacing="10px"> |
- | <table width="100%"> | + | <tr align="left"> |
- | <tr> | + | <td class="ntext">a)</td> |
- | <td align="center"> | + | <td class="ntext" width="33%">$\sin{x}=\displaystyle \frac{\sqrt{3}}{2}$</td> |
- | [[Bild:4_3_7a.gif]] | + | <td class="ntext">b)</td> |
- | </td> | + | <td class="ntext" width="33%">$\cos{x}=\displaystyle \frac{1}{2} $</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$\sin{x}=0$</td> |
| </tr> | | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%">$\sin{5x}=\displaystyle \frac{1}{\sqrt{2}} $</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$\sin{5x}=\displaystyle \frac{1}{2}$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$\cos{3x}=-\displaystyle\frac{1}{\sqrt{2}}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Lösning b) </div> | + | <table width="100%" cellspacing="10px"> |
- | <div class=NavContent> | + | <tr align="left"> |
- | Lösning till delfråga b) | + | <td class="ntext">a)</td> |
- | <table width="100%"> | + | <td class="ntext" width="33%"> |
- | <tr> | + | $\left\{\eqalign{ |
- | <td align="center"> | + | x&=\displaystyle\frac{\pi}{3}+2n\pi\cr |
- | [[Bild:4_3_7b.gif]] | + | x&=\displaystyle\frac{2\pi}{3}+2n\pi } \right.$ |
| </td> | | </td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle\frac{\pi}{3}+2n\pi\cr |
| + | x&=\displaystyle\frac{5\pi}{3}+2n\pi } \right.$ |
| + | </td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%"> |
| + | $x=n\pi$</td> |
| </tr> | | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle\frac{\pi}{20}+\displaystyle\frac{2n\pi}{5}\cr |
| + | x&=\displaystyle\frac{3\pi}{20}+\displaystyle\frac{2n\pi}{5} } \right.$ |
| + | </td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle\frac{\pi}{30}+\displaystyle\frac{2n\pi}{5}\cr |
| + | x&=\displaystyle\frac{\pi}{6}+\displaystyle\frac{2n\pi}{5}} \right.$ |
| + | </td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle\frac{\pi}{4}+\displaystyle\frac{2n\pi}{3}\cr |
| + | x&=\displaystyle\frac{5\pi}{12}+\displaystyle\frac{2n\pi}{3}} \right.$ |
| + | </td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |
| | | |
- | ==Övning 4.3:8== | + | ==Övning 4.4:3== |
| <div class="ovning"> | | <div class="ovning"> |
- | Visa följande trigonometriska samband | + | Lös ekvationen |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext>a)</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext width="100%">$\tan^2v=\displaystyle\frac{\sin^2v}{1-\sin^2v}$</td> | + | <td class="ntext" width="50%">$\cos{x}=\cos{\displaystyle \frac{\pi}{6}}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\sin{x}=\sin{\displaystyle \frac{\pi}{5}}$</td> |
| </tr> | | </tr> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext>b)</td> | + | <td class="ntext">c)</td> |
- | <td class="ntext width="100%">$\displaystyle \frac{1}{\cos v}-\tan v=\frac{\cos v}{1+\sin v}$</td> | + | <td class="ntext" width="50%">$\sin{(x+40^\circ)}=\sin{65^\circ}$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$\sin{3x}=\sin{15^\circ}$</td> |
| </tr> | | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext>c)</td> | + | <td class="ntext">a)</td> |
- | <td class="ntext width="100%">$\tan\displaystyle\frac{u}{2}=\frac{\sin u}{1+\cos u}$</td> | + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle\frac{\pi}{6}+2n\pi\cr |
| + | x&=\displaystyle\frac{11\pi}{6}+2n\pi |
| + | }\right.$ |
| + | </td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle\frac{\pi}{5}+2n\pi\cr |
| + | x&=\displaystyle\frac{4\pi}{5}+2n\pi |
| + | }\right.$ |
| + | </td> |
| </tr> | | </tr> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext>d)</td> | + | <td class="ntext">c)</td> |
- | <td class="ntext width="100%">$\displaystyle\frac{\cos (u+v)}{\cos u \cos v}= 1- \tan u \tan v$</td> | + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=25^\circ + n\cdot 360^\circ\cr |
| + | x&=75^\circ + n\cdot 360^\circ |
| + | }\right.$ |
| + | </td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=5^\circ + n \cdot 120^\circ \cr |
| + | x&= 55^\circ + n \cdot 120^\circ |
| + | }\right.$ |
| + | </td> |
| </tr> | | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | ==Övning 4.4:4== |
- | <div class=NavHead>Lösning a) </div> | + | <div class="ovning"> |
- | <div class=NavContent> | + | Bestäm de vinklar $\,v\,$ i intervallet $\,0^\circ \leq v \leq 360^\circ\,$ som uppfyller $\ \cos{\left(2v+10^\circ\right)}=\cos{110^\circ}\,$. |
- | Lösning till delfråga a) | + | </div> |
- | <table width="100%"> | + | |
| + | <div class="svar"> |
| + | <table width="100%" cellpadding="10px"> |
| <tr> | | <tr> |
- | <td align="center"> | + | <td align="left"> |
- | [[Bild:4_3_8a.gif]] | + | $v_1=50^\circ$, $\ \ v_2=120^\circ$, $\ \ v_3=230^\circ\ \ $ och $\ \ v_4=300^\circ$ |
| </td> | | </td> |
| </tr> | | </tr> |
| </table> | | </table> |
| </div> | | </div> |
| + | |
| + | ==Övning 4.4:5== |
| + | <div class="ovning"> |
| + | Lös ekvationen |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">$\sin{3x}=\sin{x}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\tan{x}=\tan{4x}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$\cos{5x}=\cos(x+\pi/5)$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Lösning b) </div> | + | <table width="100%" cellspacing="10px"> |
- | <div class=NavContent> | + | <tr align="left"> |
- | Lösning till delfråga b) | + | <td class="ntext">a)</td> |
- | <table width="100%"> | + | <td class="ntext" width="50%"> |
- | <tr> | + | $\left\{\eqalign{ |
- | <td align="center"> | + | x&=n\pi\cr |
- | [[Bild:4_3_8b.gif]] | + | x&=\displaystyle \frac{\pi}{4}+\displaystyle \frac{n\pi}{2} |
| + | }\right.$ |
| </td> | | </td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$x=\displaystyle \frac{n\pi}{3}$</td> |
| </tr> | | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle \frac{\pi}{20}+\displaystyle \frac{n\pi}{2}\cr |
| + | x&=-\displaystyle \frac{\pi}{30}+\displaystyle \frac{n\pi}{3} |
| + | }\right.$ |
| + | </td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
| </div> | | </div> |
| + | |
| + | ==Övning 4.4:6== |
| + | <div class="ovning"> |
| + | Lös ekvationen |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">$\sin x\cdot \cos 3x = 2\sin x$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\sqrt{2}\sin{x}\cos{x}=\cos{x}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$\sin 2x = -\sin x$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Lösning c) </div> | + | <table width="100%" cellspacing="10px"> |
- | <div class=NavContent> | + | <tr align="left"> |
- | Lösning till delfråga c) | + | <td class="ntext">a)</td> |
- | <table width="100%"> | + | <td class="ntext" width="50%"> |
- | <tr> | + | $x=n\pi$ |
- | <td align="center"> | + | </td> |
- | [[Bild:4_3_8c-1(2).gif]] | + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle \frac{\pi}{4}+2n\pi\cr |
| + | x&=\displaystyle \frac{\pi}{2}+n\pi\cr |
| + | x&=\displaystyle \frac{3\pi}{4}+2n\pi}\right.$ |
| </td> | | </td> |
| </tr> | | </tr> |
- | <tr> | + | <tr align="left"> |
- | <td align="center"> | + | <td class="ntext">c)</td> |
- | [[Bild:4_3_8c-2(2).gif]] | + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=\displaystyle \frac{2n\pi}{3}\cr |
| + | x&=\displaystyle \pi + 2n\pi\cr |
| + | }\right.$ |
| </td> | | </td> |
| </tr> | | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
| </div> | | </div> |
| + | |
| + | ==Övning 4.4:7== |
| + | <div class="ovning"> |
| + | Lös ekvationen |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">$2\sin^2{x}+\sin{x}=1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$2\sin^2{x}-3\cos{x}=0$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$\cos{3x}=\sin{4x}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Lösning d) </div> | + | <table width="100%" cellspacing="10px"> |
- | <div class=NavContent> | + | <tr align="left"> |
- | Lösning till delfråga a) | + | <td class="ntext">a)</td> |
- | <table width="100%"> | + | <td class="ntext" width="50%"> |
- | <tr> | + | $\left\{ \matrix{ |
- | <td align="center"> | + | x=\displaystyle \frac{\pi}{6}+2n\pi\cr |
- | [[Bild:4_3_8d.gif]] | + | x=\displaystyle \frac{5\pi}{6}+2n\pi\cr |
| + | x=\displaystyle \frac{3\pi}{2}+2n\pi |
| + | }\right.$ |
| </td> | | </td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$x=\pm \displaystyle \frac{\pi}{3} + 2n\pi $</td> |
| </tr> | | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%"> |
| + | $\left\{ \matrix{ |
| + | x=\displaystyle \frac{\pi}{2}+2n\pi\cr |
| + | x=\displaystyle \frac{\pi}{14}+\displaystyle \frac{2n\pi}{7} |
| + | }\right.$ |
| + | </td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |
| | | |
- | ==Övning 4.3:9== | + | ==Övning 4.4:8== |
| <div class="ovning"> | | <div class="ovning"> |
| + | Lös ekvationen |
| <table width="100%" cellspacing="10px"> | | <table width="100%" cellspacing="10px"> |
| <tr align="left"> | | <tr align="left"> |
- | <td class="ntext> | + | <td class="ntext">a)</td> |
- | Visa "Feynmans likhet" | + | <td class="ntext" width="50%">$\sin{2x}=\sqrt{2}\cos{x}$</td> |
- | $$\cos 20^\circ \cdot \cos 40^\circ \cdot \cos 80^\circ = \displaystyle\frac{1}{8}\,\mbox{.}$$ | + | <td class="ntext">b)</td> |
- | (Ledtråd: Använd formeln för dubbla vinkeln på $\,\sin 160^\circ\,$.) | + | <td class="ntext" width="50%">$\sin{x}=\sqrt{3}\cos{x}$</td> |
- | </td> | + | |
| </tr> | | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$\displaystyle \frac{1}{\cos^2{x}}=1-\tan{x}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
| </div> | | </div> |
| | | |
- | <div class=NavFrame style="CLEAR: both"> | + | <div class="svar"> |
- | <div class=NavHead>Lösning </div> | + | <table width="100%" cellspacing="10px"> |
- | <div class=NavContent> | + | <tr align="left"> |
- | <table width="100%"> | + | <td class="ntext">a)</td> |
- | <tr> | + | <td class="ntext" width="50%"> |
- | <td align="center"> | + | $\left\{\eqalign{ |
- | [[Bild:4_3_9-1(2).gif]] | + | x&=\displaystyle \frac{\pi}{4}+2n\pi\cr |
| + | x&=\displaystyle \frac{\pi}{2}+n\pi\cr |
| + | x&=\displaystyle \frac{3\pi}{4}+2n\pi |
| + | }\right.$ |
| </td> | | </td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$x=\displaystyle \frac{\pi}{3}+n\pi$</td> |
| </tr> | | </tr> |
- | <tr> | + | <tr align="left"> |
- | <td align="center"> | + | <td class="ntext">c)</td> |
- | [[Bild:4_3_9-2(2).gif]] | + | <td class="ntext" width="50%"> |
| + | $\left\{\eqalign{ |
| + | x&=n\pi\cr |
| + | x&=\displaystyle \frac{3\pi}{4}+n\pi |
| + | }\right.$ |
| </td> | | </td> |
| </tr> | | </tr> |
| + | <tr><td height="5px"/></tr> |
| </table> | | </table> |
- | </div> | |
| </div> | | </div> |