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Rad 414: |
Rad 414: |
| </table> | | </table> |
| | | |
| + | </div> |
| + | |
| + | ==Övning 4.2:1== |
| + | <div class="ovning"> |
| + | Bestäm längden av sidan som är markerad med $\,x\,$ uttryckt med hjälp av de trigonometriska funktionerna. |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left" valign="top"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_1a.gif]]</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_1b.gif]]</td> |
| + | </tr> |
| + | <tr align="left" valign="top"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_1c.gif]]</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_1d.gif]]</td> |
| + | </tr> |
| + | <tr align="left" valign="top"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_1e.gif]]</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_1f.gif]]</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | Facit till alla delfrågor<br \> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%"> $x=13\cdot\tan {27 ^\circ} \approx 6{,}62$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$x=25\cdot\cos {32 ^\circ} \approx 21{,}2$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$x=\displaystyle\frac{14}{\tan {40 ^\circ}} \approx 16{,}7$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$x=\displaystyle\frac{16}{\cos {20 ^\circ}} \approx 17{,}0$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">$x=\displaystyle\frac{11}{\sin {35 ^\circ}} \approx 19{,}2$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">$x=\displaystyle\frac{19}{\tan {50 ^\circ}} \approx 15{,}9$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </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_2_1a.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_2_1b.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_2_1c-1(2).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_1c-2(2).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_2_1d.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning e) </DIV> |
| + | <div class=NavContent> |
| + | Lösning till delfråga e) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_1e.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning f) </div> |
| + | <div class=NavContent> |
| + | Lösning till delfråga f) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_1f.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:2== |
| + | <div class="ovning"> |
| + | Bestäm en trigonometrisk ekvation som vinkeln $\,v\,$ uppfyller. |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left" valign="top"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_2a.gif]]</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_2b.gif]]</td> |
| + | </tr> |
| + | <tr align="left" valign="top"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_2c.gif]]</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_2d.gif]]</td> |
| + | </tr> |
| + | <tr align="left" valign="top"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_2e.gif]]</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">[[Bild:O4_2_2f.gif]]</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | Facit till alla delfrågor<br \> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="50%"> $\tan v=\displaystyle\frac{2}{5}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="50%">$\sin v=\displaystyle\frac{7}{11}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="50%">$\cos v=\displaystyle\frac{5}{7}$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="50%">$\sin v=\displaystyle\frac{3}{5}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="50%">$v=30 ^\circ$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="50%">$\sin \displaystyle\frac{v}{2}=\displaystyle\frac{1}{3}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </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_2_2a.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_2_2b.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_2_2c.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_2_2d.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning e) </DIV> |
| + | <div class=NavContent> |
| + | Lösning till delfråga e) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_2e.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning f) </div> |
| + | <div class=NavContent> |
| + | Lösning till delfråga f) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_2f.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:3== |
| + | <div class="ovning"> |
| + | Bestäm |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%"> $\sin{\left(-\displaystyle \frac{\pi}{2}\right)}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$\cos{2\pi}$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$\sin{9\pi}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%"> $\cos{\displaystyle \frac{7\pi}{2}}$</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$\sin{\displaystyle \frac{3\pi}{4}}$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$\cos{\left(-\displaystyle \frac{\pi}{6}\right)}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | Facit till alla delfrågor<br \> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$-1$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$1$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$0$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%">$0$</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$\displaystyle \frac{1}{\sqrt{2}}$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$\displaystyle \frac{\sqrt{3}}{2}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </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_2_3a.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_2_3b.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_2_3c.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_2_3d.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning e) </DIV> |
| + | <div class=NavContent> |
| + | Lösning till delfråga e) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_3e-1(2).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_3e-2(2).gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning f) </div> |
| + | <div class=NavContent> |
| + | Lösning till delfråga f) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_3f-1(2).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_3f-2(2).gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:4== |
| + | <div class="ovning"> |
| + | Bestäm |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$\cos{\displaystyle \frac{11\pi}{6}}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$\cos{\displaystyle \frac{11\pi}{3}}$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$\tan{\displaystyle \frac{3\pi}{4}}$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%">$\tan{\pi}$</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$\tan{\displaystyle \frac{7\pi}{6}}$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$\tan{\left(-\displaystyle \frac{5\pi}{3}\right)}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | Facit till alla delfrågor<br \> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="33%">$\displaystyle \frac{\sqrt{3}}{2}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="33%">$\displaystyle \frac{1}{2}$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="33%">$-1$</td> |
| + | </tr> |
| + | <tr align="left"> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="33%">$0$</td> |
| + | <td class="ntext">e)</td> |
| + | <td class="ntext" width="33%">$\displaystyle \frac{1}{\sqrt{3}}$</td> |
| + | <td class="ntext">f)</td> |
| + | <td class="ntext" width="33%">$\sqrt{3}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </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_2_4a.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_2_4b-1(2).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_4b-2(2).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_2_4c.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_2_4d.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning e) </DIV> |
| + | <div class=NavContent> |
| + | Lösning till delfråga e) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_4e.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning f) </div> |
| + | <div class=NavContent> |
| + | Lösning till delfråga f) |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_4f.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:5== |
| + | <div class="ovning"> |
| + | Bestäm |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="25%">$\cos{135^\circ}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="25%">$\tan{225^\circ}$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="25%">$\cos{330^\circ}$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="25%">$\tan{495^\circ}$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | Facit till alla delfrågor<br \> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext">a)</td> |
| + | <td class="ntext" width="25%">$-\displaystyle \frac{1}{\sqrt{2}}$</td> |
| + | <td class="ntext">b)</td> |
| + | <td class="ntext" width="25%">$1$</td> |
| + | <td class="ntext">c)</td> |
| + | <td class="ntext" width="25%">$\displaystyle \frac{\sqrt{3}}{2}$</td> |
| + | <td class="ntext">d)</td> |
| + | <td class="ntext" width="25%">$-1$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </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_2_5a.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_2_5b.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_2_5c.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_2_5d.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:6== |
| + | <div class="ovning"> |
| + | Bestäm längden av sidan som är markerad med $\,x\,$. |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="center"> |
| + | <td class="ntext" width="100%">[[Bild:O4_2_6.gif]]</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext" width="100%">$x= \sqrt{3}-1$</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning </div> |
| + | <div class=NavContent> |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_6.gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:7== |
| + | <div class="ovning"> |
| + | För att mäta upp bredden av en älv mäter vi från två punkter A och B längs den ena raka stranden vinkeln till ett träd C på motsatt sida älven. Hur bred är älven om måtten i figuren gäller? |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="center"> |
| + | <td class="ntext" width="100%">[[Bild:O_4_2_7.gif]]</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class="svar"> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext" width="100%">Älvens bredd är $\ \displaystyle\frac{100}{\sqrt{3}-1}$ m $\approx 136{,}6$ m.</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | |
| + | ==Övning 4.2:8== |
| + | <div class="ovning"> |
| + | En stång med längd $\,\ell\,$ är upphängd i två linor med längd $\,a\,$ resp. $\,b\,$ enligt figuren. Linorna bildar vinklar $\,\alpha\,$ resp. $\,\beta\,$ med vertikalen. Bestäm en trigonometrisk ekvation för vinkeln $\,\gamma\,$ som stången bildar med vertikalen. |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="center"> |
| + | <td class="ntext" width="100%">[[Bild:O_4_2_8.gif]]</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext" width="100%">$\ell\cos \gamma=a \cos \alpha - b\cos \beta $</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning </div> |
| + | <div class=NavContent> |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_8-1(2).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_8-2(2).gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | ==Övning 4.2:9== |
| + | <div class="ovning"> |
| + | Bilvägen från ''A'' till ''B'' består av tre rätlinjiga delar ''AP'', ''PQ'' och ''QB'', vilka är 4,0 km, 12,0 km respektive 5,0 km. De i figuren markerade vinklarna vid ''P'' och ''Q'' är 30° respektive 90°. Beräkna avståndet fågelvägen från ''A'' till ''B''. (Uppgiften är hämtad ur Centrala provet i matematik, november 1976, men aningen modifierad.) |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="center"> |
| + | <td class="ntext" width="100%">[[Bild:O4_2_9.gif]]</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Facit </div> |
| + | <div class=NavContent> |
| + | <table width="100%" cellspacing="10px"> |
| + | <tr align="left"> |
| + | <td class="ntext" width="100%">Avståndet är $\ \sqrt{205-48\sqrt{3}} \approx 11{,}0$ km.</td> |
| + | </tr> |
| + | <tr><td height="5px"/></tr> |
| + | </table> |
| + | </div> |
| + | </div> |
| + | |
| + | <div class=NavFrame style="CLEAR: both"> |
| + | <div class=NavHead>Lösning </div> |
| + | <div class=NavContent> |
| + | <table width="100%"> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_9-1(3).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_9-2(3).gif]] |
| + | </td> |
| + | </tr> |
| + | <tr> |
| + | <td align="center"> |
| + | [[Bild:4_2_9-3(3).gif]] |
| + | </td> |
| + | </tr> |
| + | </table> |
| + | </div> |
| </div> | | </div> |