4.3 Übungen
Aus Online Mathematik Brückenkurs 1
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- | {{Ej vald flik|[[4.3 Trigonometriska samband| | + | {{Ej vald flik|[[4.3 Trigonometriska samband|Theory]]}} |
- | {{Vald flik|[[4.3 Övningar| | + | {{Vald flik|[[4.3 Övningar|Exercises]]}} |
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- | === | + | ===Exercise 4.3:1=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Determine the angles <math>\,v\,</math> between <math>\,\displaystyle \frac{\pi}{2}\,</math> and <math>\,2\pi\,</math> which satisfy | |
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|a) | |a) | ||
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</div>{{#NAVCONTENT:Svar|Svar 4.3:1|Lösning a |Lösning 4.3:1a|Lösning b |Lösning 4.3:1b|Lösning c |Lösning 4.3:1c}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:1|Lösning a |Lösning 4.3:1a|Lösning b |Lösning 4.3:1b|Lösning c |Lösning 4.3:1c}} | ||
- | === | + | ===Exercise 4.3:2=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Determine the angles <math>\,v\,</math> between 0 and <math>\,\pi\,</math> which satisfy | |
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|a) | |a) | ||
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</div>{{#NAVCONTENT:Svar|Svar 4.3:2|Lösning a |Lösning 4.3:2a|Lösning b |Lösning 4.3:2b}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:2|Lösning a |Lösning 4.3:2a|Lösning b |Lösning 4.3:2b}} | ||
- | === | + | ===Exercise 4.3:3=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Suppose that <math>\,-\displaystyle \frac{\pi}{2} \leq v \leq \displaystyle \frac{\pi}{2}\,</math> and that <math>\,\sin{v} = a\,</math>. With the help of <math>\,a</math> express | |
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|a) | |a) | ||
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</div>{{#NAVCONTENT:Svar|Svar 4.3:3|Lösning a |Lösning 4.3:3a|Lösning b |Lösning 4.3:3b|Lösning c |Lösning 4.3:3c|Lösning d |Lösning 4.3:3d|Lösning e |Lösning 4.3:3e|Lösning f |Lösning 4.3:3f}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:3|Lösning a |Lösning 4.3:3a|Lösning b |Lösning 4.3:3b|Lösning c |Lösning 4.3:3c|Lösning d |Lösning 4.3:3d|Lösning e |Lösning 4.3:3e|Lösning f |Lösning 4.3:3f}} | ||
- | === | + | ===Exercise 4.3:4=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Suppose that <math>\,0 \leq v \leq \pi\,</math> and that <math>\,\cos{v}=b\,</math>. With the help of <math>\,b</math> express | |
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|a) | |a) | ||
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</div>{{#NAVCONTENT:Svar|Svar 4.3:4|Lösning a |Lösning 4.3:4a|Lösning b |Lösning 4.3:4b|Lösning c |Lösning 4.3:4c|Lösning d |Lösning 4.3:4d|Lösning e |Lösning 4.3:4e|Lösning f |Lösning 4.3:4f}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:4|Lösning a |Lösning 4.3:4a|Lösning b |Lösning 4.3:4b|Lösning c |Lösning 4.3:4c|Lösning d |Lösning 4.3:4d|Lösning e |Lösning 4.3:4e|Lösning f |Lösning 4.3:4f}} | ||
- | === | + | ===Exercise 4.3:5=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Determine <math>\,\cos{v}\,</math> and <math>\,\tan{v}\,</math>, where <math>\,v\,</math> is an acute angle in a triangle such that <math>\,\sin{v}=\displaystyle \frac{5}{7}\,</math>. | |
</div>{{#NAVCONTENT:Svar|Svar 4.3:5|Lösning |Lösning 4.3:5}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:5|Lösning |Lösning 4.3:5}} | ||
- | === | + | ===Exercise 4.3:6=== |
<div class="ovning"> | <div class="ovning"> | ||
{| width="100%" cellspacing="10px" | {| width="100%" cellspacing="10px" | ||
|a) | |a) | ||
- | |width="100%" | | + | |width="100%" | Determine <math>\ \sin{v}\ </math> and <math>\ \tan{v}\ </math> if <math>\ \cos{v}=\displaystyle \frac{3}{4}\ </math> and <math>\ \displaystyle \frac{3\pi}{2} \leq v \leq 2\pi\,</math>. |
|- | |- | ||
|b) | |b) | ||
- | |width="100%" | | + | |width="100%" | Determine <math>\ \cos{v}\ </math> and <math>\ \tan{v}\ </math> if <math>\ \sin{v}=\displaystyle \frac{3}{10}\ </math> and <math>\,v\,</math> lies in the second quadrant. |
|- | |- | ||
|c) | |c) | ||
- | |width="100%" | | + | |width="100%" | Determine <math>\ \sin{v}\ </math> and <math>\ \cos{v}\ </math> if <math>\ \tan{v}=3\ </math> and <math>\ \pi \leq v \leq \displaystyle \frac{3\pi}{2}\,</math>. |
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</div>{{#NAVCONTENT:Svar|Svar 4.3:6|Lösning a |Lösning 4.3:6a|Lösning b |Lösning 4.3:6b|Lösning c |Lösning 4.3:6c}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:6|Lösning a |Lösning 4.3:6a|Lösning b |Lösning 4.3:6b|Lösning c |Lösning 4.3:6c}} | ||
- | === | + | ===Exercise 4.3:7=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Determine <math>\ \sin{(x+y)}\ </math> if | |
{| width="100%" cellspacing="10px" | {| width="100%" cellspacing="10px" | ||
|a) | |a) | ||
- | |width="100%" | <math>\sin{x}=\displaystyle \frac{2}{3}\,</math>,<math>\ \sin{y}=\displaystyle \frac{1}{3}\ </math> | + | |width="100%" | <math>\sin{x}=\displaystyle \frac{2}{3}\,</math>,<math>\ \sin{y}=\displaystyle \frac{1}{3}\ </math> and <math>\,x\,</math>, <math> \,y\,</math> are angles in the first quadrant. |
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|b) | |b) | ||
- | |width="100%" | <math>\cos{x}=\displaystyle \frac{2}{5}\,</math>, <math>\ \cos{y}=\displaystyle \frac{3}{5}\ </math> | + | |width="100%" | <math>\cos{x}=\displaystyle \frac{2}{5}\,</math>, <math>\ \cos{y}=\displaystyle \frac{3}{5}\ </math> and <math>\,x\,</math>, <math>\,y\,</math> are angles in the first quadrant. |
|} | |} | ||
</div>{{#NAVCONTENT:Svar|Svar 4.3:7|Lösning a |Lösning 4.3:7a|Lösning b |Lösning 4.3:7b}} | </div>{{#NAVCONTENT:Svar|Svar 4.3:7|Lösning a |Lösning 4.3:7a|Lösning b |Lösning 4.3:7b}} | ||
- | === | + | ===Exercise 4.3:8=== |
<div class="ovning"> | <div class="ovning"> | ||
- | + | Show the following trigonometric relations | |
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|a) | |a) | ||
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</div>{{#NAVCONTENT:Lösning a |Lösning 4.3:8a|Lösning b |Lösning 4.3:8b|Lösning c |Lösning 4.3:8c|Lösning d |Lösning 4.3:8d}} | </div>{{#NAVCONTENT:Lösning a |Lösning 4.3:8a|Lösning b |Lösning 4.3:8b|Lösning c |Lösning 4.3:8c|Lösning d |Lösning 4.3:8d}} | ||
- | === | + | ===Exercise 4.3:9=== |
<div class="ovning"> | <div class="ovning"> | ||
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| | | | ||
- | |width="100%" | | + | |width="100%" | Show Feynman's equality |
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| | | | ||
- | |width="100%" |( | + | |width="100%" |(Hint: use the formula for double angles on <math>\,\sin 160^\circ\,</math>.) |
|} | |} | ||
</div>{{#NAVCONTENT:Lösning |Lösning 4.3:9}} | </div>{{#NAVCONTENT:Lösning |Lösning 4.3:9}} |
Version vom 18:14, 3. Aug. 2008
Exercise 4.3:1
Determine the angles \displaystyle \,v\, between \displaystyle \,\displaystyle \frac{\pi}{2}\, and \displaystyle \,2\pi\, which satisfy
a) | \displaystyle \cos{v}=\cos{\displaystyle \frac{\pi}{5}} | b) | \displaystyle \sin{v}=\sin{\displaystyle \frac{\pi}{7}} | c) | \displaystyle \tan{v}=\tan{\displaystyle \frac{2\pi}{7}} |
Exercise 4.3:2
Determine the angles \displaystyle \,v\, between 0 and \displaystyle \,\pi\, which satisfy
a) | \displaystyle \cos{v} = \cos{\displaystyle \frac{3\pi}{2}} | b) | \displaystyle \cos{v} = \cos{ \displaystyle \frac{7\pi}{5}} |
Exercise 4.3:3
Suppose that \displaystyle \,-\displaystyle \frac{\pi}{2} \leq v \leq \displaystyle \frac{\pi}{2}\, and that \displaystyle \,\sin{v} = a\,. With the help of \displaystyle \,a express
a) | \displaystyle \sin{(-v)} | b) | \displaystyle \sin{(\pi-v)} |
c) | \displaystyle \cos{v} | d) | \displaystyle \sin{\left(\displaystyle \frac{\pi}{2}-v\right)} |
e) | \displaystyle \cos{\left( \displaystyle \frac{\pi}{2} + v\right)} | f) | \displaystyle \sin{\left( \displaystyle \frac{\pi}{3} + v \right)} |
Exercise 4.3:4
Suppose that \displaystyle \,0 \leq v \leq \pi\, and that \displaystyle \,\cos{v}=b\,. With the help of \displaystyle \,b express
a) | \displaystyle \sin^2{v} | b) | \displaystyle \sin{v} |
c) | \displaystyle \sin{2v} | d) | \displaystyle \cos{2v} |
e) | \displaystyle \sin{\left( v+\displaystyle \frac{\pi}{4} \right)} | f) | \displaystyle \cos{\left( v-\displaystyle \frac{\pi}{3} \right)} |
Exercise 4.3:5
Determine \displaystyle \,\cos{v}\, and \displaystyle \,\tan{v}\,, where \displaystyle \,v\, is an acute angle in a triangle such that \displaystyle \,\sin{v}=\displaystyle \frac{5}{7}\,.
Exercise 4.3:6
a) | Determine \displaystyle \ \sin{v}\ and \displaystyle \ \tan{v}\ if \displaystyle \ \cos{v}=\displaystyle \frac{3}{4}\ and \displaystyle \ \displaystyle \frac{3\pi}{2} \leq v \leq 2\pi\,. |
b) | Determine \displaystyle \ \cos{v}\ and \displaystyle \ \tan{v}\ if \displaystyle \ \sin{v}=\displaystyle \frac{3}{10}\ and \displaystyle \,v\, lies in the second quadrant. |
c) | Determine \displaystyle \ \sin{v}\ and \displaystyle \ \cos{v}\ if \displaystyle \ \tan{v}=3\ and \displaystyle \ \pi \leq v \leq \displaystyle \frac{3\pi}{2}\,. |
Exercise 4.3:7
Determine \displaystyle \ \sin{(x+y)}\ if
a) | \displaystyle \sin{x}=\displaystyle \frac{2}{3}\,,\displaystyle \ \sin{y}=\displaystyle \frac{1}{3}\ and \displaystyle \,x\,, \displaystyle \,y\, are angles in the first quadrant. |
b) | \displaystyle \cos{x}=\displaystyle \frac{2}{5}\,, \displaystyle \ \cos{y}=\displaystyle \frac{3}{5}\ and \displaystyle \,x\,, \displaystyle \,y\, are angles in the first quadrant. |
Exercise 4.3:8
Show the following trigonometric relations
a) | \displaystyle \tan^2v=\displaystyle\frac{\sin^2v}{1-\sin^2v} |
b) | \displaystyle \displaystyle \frac{1}{\cos v}-\tan v=\frac{\cos v}{1+\sin v} |
c) | \displaystyle \tan\displaystyle\frac{u}{2}=\frac{\sin u}{1+\cos u} |
d) | \displaystyle \displaystyle\frac{\cos (u+v)}{\cos u \cos v}= 1- \tan u \tan v |
Exercise 4.3:9
Show Feynman's equality | |
(Hint: use the formula for double angles on \displaystyle \,\sin 160^\circ\,.) |