4.4 Övningar
Sommarmatte 1
Versionen från 30 april 2007 kl. 17.02 (redigera) Ossiang (Diskussion | bidrag) (→Övning 4.4:2) ← Gå till föregående ändring |
Versionen från 30 april 2007 kl. 17.03 (redigera) (ogör) Ossiang (Diskussion | bidrag) (→Övning 4.4:1) Gå till nästa ändring → |
||
Rad 1: | Rad 1: | ||
- | ==Övning 4.4:1== | + | ==Övning 4.4:1== |
<div class="ovning"> | <div class="ovning"> | ||
För vilka vinklar $v$, där $0 \leq v\leq 2\pi$, gäller att | 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">$\textrm{a) }$</td> | + | <td class="ntext">a)</td> |
<td class="ntext">$\sin{v}=\displaystyle \frac{1}{2}$</td> | <td class="ntext">$\sin{v}=\displaystyle \frac{1}{2}$</td> | ||
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
<td class="ntext">$\cos{v}=\displaystyle \frac{1}{2}$</td> | <td class="ntext">$\cos{v}=\displaystyle \frac{1}{2}$</td> | ||
- | <td class="ntext">$\textrm{c) }$</td> | + | <td class="ntext">c)</td> |
<td class="ntext">$\sin{v}=1$</td> | <td class="ntext">$\sin{v}=1$</td> | ||
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{d) }$</td> | + | <td class="ntext">d)</td> |
<td class="ntext">$\tan{v}=1$</td> | <td class="ntext">$\tan{v}=1$</td> | ||
- | <td class="ntext">$\textrm{e) }$</td> | + | <td class="ntext">e)</td> |
<td class="ntext">$\cos{v}=2$</td> | <td class="ntext">$\cos{v}=2$</td> | ||
- | <td class="ntext">$\textrm{f) }$</td> | + | <td class="ntext">f)</td> |
<td class="ntext">$\sin{v}=-\displaystyle \frac{1}{2}$</td> | <td class="ntext">$\sin{v}=-\displaystyle \frac{1}{2}$</td> | ||
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{g) }$</td> | + | <td class="ntext">g)</td> |
<td class="ntext">$\tan{v}=-\displaystyle \frac{1}{\sqrt{3}}$</td> | <td class="ntext">$\tan{v}=-\displaystyle \frac{1}{\sqrt{3}}$</td> | ||
<td class="ntext"></td> | <td class="ntext"></td> | ||
Rad 39: | Rad 39: | ||
<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">$\displaystyle v=\frac{\pi}{6}, \displaystyle v=\frac{5\pi}{6}$</td> | <td class="ntext">$\displaystyle v=\frac{\pi}{6}, \displaystyle v=\frac{5\pi}{6}$</td> | ||
- | <td class="ntext">$\textrm{b) }$</td> | + | <td class="ntext">b)</td> |
<td class="ntext">$\displaystyle v=\frac{\pi}{3}, \displaystyle v=\frac{5\pi}{3}$</td> | <td class="ntext">$\displaystyle v=\frac{\pi}{3}, \displaystyle v=\frac{5\pi}{3}$</td> | ||
- | <td class="ntext">$\textrm{c) }$</td> | + | <td class="ntext">c)</td> |
<td class="ntext">$\displaystyle v=\frac{\pi}{2}$</td> | <td class="ntext">$\displaystyle v=\frac{\pi}{2}$</td> | ||
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{d) }$</td> | + | <td class="ntext">d)</td> |
<td class="ntext">$\displaystyle v=\frac{\pi}{4},\displaystyle v=\frac{5\pi}{4}$</td> | <td class="ntext">$\displaystyle v=\frac{\pi}{4},\displaystyle v=\frac{5\pi}{4}$</td> | ||
- | <td class="ntext">$\textrm{e) }$</td> | + | <td class="ntext">e)</td> |
- | <td class="ntext">$\textrm{lösning saknas}$</td> | + | <td class="ntext">lösning saknas}$</td> |
- | <td class="ntext">$\textrm{f) }$</td> | + | <td class="ntext">f)</td> |
<td class="ntext">$\displaystyle v=\frac{11\pi}{6}, \displaystyle v=\frac{7\pi}{6}$</td> | <td class="ntext">$\displaystyle v=\frac{11\pi}{6}, \displaystyle v=\frac{7\pi}{6}$</td> | ||
</tr> | </tr> | ||
<tr><td height="5px"/></tr> | <tr><td height="5px"/></tr> | ||
<tr align="left"> | <tr align="left"> | ||
- | <td class="ntext">$\textrm{g) }$</td> | + | <td class="ntext">g)</td> |
<td class="ntext">$\displaystyle v=\frac{5\pi}{6}, \displaystyle v=\frac{11\pi}{6}$</td> | <td class="ntext">$\displaystyle v=\frac{5\pi}{6}, \displaystyle v=\frac{11\pi}{6}$</td> | ||
<td class="ntext"></td> | <td class="ntext"></td> |
Versionen från 30 april 2007 kl. 17.03
Innehåll |
Övning 4.4:1
För vilka vinklar $v$, där $0 \leq v\leq 2\pi$, gäller att
a) | $\sin{v}=\displaystyle \frac{1}{2}$ | b) | $\cos{v}=\displaystyle \frac{1}{2}$ | c) | $\sin{v}=1$ |
d) | $\tan{v}=1$ | e) | $\cos{v}=2$ | f) | $\sin{v}=-\displaystyle \frac{1}{2}$ |
g) | $\tan{v}=-\displaystyle \frac{1}{\sqrt{3}}$ | ||||
Facit till alla delfrågorna
a) | $\displaystyle v=\frac{\pi}{6}, \displaystyle v=\frac{5\pi}{6}$ | b) | $\displaystyle v=\frac{\pi}{3}, \displaystyle v=\frac{5\pi}{3}$ | c) | $\displaystyle v=\frac{\pi}{2}$ |
d) | $\displaystyle v=\frac{\pi}{4},\displaystyle v=\frac{5\pi}{4}$ | e) | lösning saknas}$ | f) | $\displaystyle v=\frac{11\pi}{6}, \displaystyle v=\frac{7\pi}{6}$ |
g) | $\displaystyle v=\frac{5\pi}{6}, \displaystyle v=\frac{11\pi}{6}$ | ||||
Övning 4.4:2
Lös ekvationen
a) | $\sin{x}=\displaystyle \frac{\sqrt{3}}{2}$ | b) | $\cos{x}=\displaystyle \frac{1}{2} $ | c) | $\sin{x}=0$ |
d) | $\sin{5x}=\displaystyle \frac{1}{\sqrt{2}} $ | e) | $\sin{5x}=\displaystyle \frac{1}{2}$ | f) | $\cos{3x}=-\displaystyle\frac{1}{\sqrt{2}}$ |
Facit till alla delfrågorna
a) |
$\left\{ \matrix{ x=\displaystyle\frac{\pi}{3}+2n\pi\cr x=\displaystyle\frac{2\pi}{3}+2n\pi } \right.$ |
b) |
$\left\{ \matrix{ x=\displaystyle\frac{\pi}{3}+2n\pi\cr x=\displaystyle\frac{5\pi}{3}+2n\pi } \right.$ |
c) | $x=n\pi$ |
d) |
$\left\{ \matrix{ x=\displaystyle\frac{\pi}{20}+\displaystyle\frac{2n\pi}{5}\cr x=\displaystyle\frac{3\pi}{20}+\displaystyle\frac{2n\pi}{5} } \right.$ |
e) |
$\left\{ \matrix{ x=\displaystyle\frac{\pi}{30}+\displaystyle\frac{2}{5}n\pi\cr x=\displaystyle\frac{\pi}{6}+\displaystyle\frac{2}{5}n\pi } \right.$ |
f) | $\left\{ \matrix{x=\displaystyle\frac{\pi}{4}+\displaystyle\frac{2}{3}n\pi\cr x=\displaystyle\frac{5\pi}{12}+\displaystyle\frac{2}{3}n\pi } \right.$ |
Övning 4.4:3
Lös ekvationen
a) | $\cos{x}=\cos{\left( \displaystyle \frac{\pi}{6} \right)}$ | b) | $\sin{x}=\sin{\left( \displaystyle \frac{\pi}{5} \right)}$ |
c) | $\sin{(x+40^\circ)}=\sin{65^\circ}$ | d) | $\sin{3x}=\sin{15^\circ}$ |
Facit till alla delfrågorna
a) |
$\left\{ \matrix{ x=\displaystyle\frac{\pi}{6}+2n\pi\cr x=\displaystyle\frac{11\pi}{6}+2n\pi }\right.$ |
b) |
$\left\{ \matrix{ x=\displaystyle\frac{\pi}{5}+2n\pi\cr x=\displaystyle\frac{4\pi}{5}+2n\pi }\right.$ |
c) |
$\left\{ \matrix{ x=25^\circ + n\cdot 360^\circ\cr x=75^\circ + n\cdot 360^\circ }\right.$ |
d) |
$\left\{ \matrix{ x=5^\circ + n \cdot 120^\circ \cr x= 55^\circ + n \cdot 120^\circ }\right.$ |
Övning 4.4:4
Bestäm de vinklar $v$ i intervallet $0^\circ \leq v \leq 360^\circ$ som uppfyller $\cos{\left(2v+10^\circ\right)}=\cos{110^\circ}$.
$v_1=50^\circ, v_2=120^\circ, v_3=230^\circ$ och $v_4=300^\circ$
Övning 4.4:5
Lös ekvationen
a) | $\sin{3x}=\sin{x}$ | b) | $\tan{x}=\tan{4x}$ | c) | $\cos{5x}=\cos(x+\pi/5)$ |
Facit till alla delfrågorna
a) |
$\left\{ \matrix{ x=n\pi\cr x=\displaystyle \frac{\pi}{4}+\displaystyle \frac{1}{2}n\pi }\right.$ |
b) | $x=\displaystyle \frac{1}{3}n\pi$ | c) |
$\left\{\matrix{ x=\displaystyle \frac{\pi}{20}+\displaystyle \frac{1}{2}n\pi\cr x=-\displaystyle \frac{\pi}{30}+\displaystyle \frac{1}{3}n\pi }\right.$ |
Övning 4.4:6
Lös ekvationen
a) | $\sin x\cdot \cos 3x = 2\sin x$ | b) | $\sqrt{2}\sin{x}\cos{x}=\cos{x}$ | c) | $\sin 2x = -\sin x$ |
Facit till alla delfrågorna
a) |
$x=n\pi$ |
b) |
$\left\{ \matrix{x=\displaystyle \frac{\pi}{4}+2n\pi\cr x=\displaystyle \frac{\pi}{2}+n\pi\cr x=\displaystyle \frac{3\pi}{4}+2n\pi}\right.$ |
c) |
$\left\{ \matrix{ x=\displaystyle \frac{2n\pi}{3}\cr x=\displaystyle \pi + 2n\pi\ }\right.$ |
Övning 4.4:7
Lös ekvationen
a) | $2\sin^2{x}+\sin{x}=1$ | b) | $2\sin^2{x}-3\cos{x}=0$ | c) | $\cos{3x}=\sin{4x}$ |
Facit till alla delfrågorna
a) |
$\left\{ \matrix{ x=\displaystyle \frac{\pi}{6}+2n\pi\cr x=\displaystyle \frac{5\pi}{6}+2n\pi\cr x=\displaystyle \frac{3\pi}{2}+2n\pi }\right.$ |
b) | $x=\pm \displaystyle \frac{\pi}{3} + 2n\pi $ | c) |
$\left\{ \matrix{ x=\displaystyle \frac{\pi}{2}+2n\pi\cr x=\displaystyle \frac{\pi}{14}+\displaystyle \frac{2}{7}n\pi }\right.$ |
Övning 4.4:8
Lös ekvationen
a) | $\sin{2x}=\sqrt{2}\cos{x}$ | b) | $\sin{x}=\sqrt{3}\cos{x}$ | c) | $\displaystyle \frac{1}{\cos^2{x}}=1-\tan{x}$ |
Facit till alla delfrågorna
a) |
$\left\{ \matrix{ x=\displaystyle \frac{\pi}{4}+2n\pi\cr x=\displaystyle \frac{\pi}{2}+n\pi\cr x=\displaystyle \frac{3\pi}{4}+2n\pi }\right.$ |
b) | $x=\displaystyle \frac{\pi}{3}+n\pi$ | c) |
$\left\{ \matrix{ x=n\pi\cr x=\displaystyle \frac{3\pi}{4}+n\pi }\right.$ |