Question 1

$sin⁡ \fracπ4$

Accepted Answer

$\frac{\sqrt{2}}{2} $

Answer

$1$

Answer

$\frac{\sqrt{3}}{2} $

Answer

$0$

Question 2

$cos \frac{\pi}{2}$

Accepted Answer

$0$

Answer

$1$

Answer

$\frac{\sqrt{3}}{2} $

Answer

$\frac{\sqrt{2}}{2} $

Question 3

$sin (\frac{\pi}{2}-\alpha)$

Accepted Answer

$cos \alpha$

Answer

$sin\frac{\pi}{2}-sin\alpha$

Answer

$sin\alpha$

Answer

$0$

Question 4

$sin (\frac{8\pi}{2}+\alpha)$

Accepted Answer

$sin\alpha$

Answer

$-cos\alpha$

Answer

$-sin \alpha$

Answer

$cos\alpha$

Question 5

$\cos{135}^{\circ}$

Accepted Answer

$-\frac{\sqrt{2}}{2}$

Answer

$\frac{\sqrt{2}}{2}$

Answer

$0$

Answer

$$\frac{\sqrt{3}}{2}$$

Question 6

$sin ({\alpha+\beta})$

Accepted Answer

$sin\alpha$ $cos\beta$ + $cos\alpha$  $sin\beta$

Answer

$sin\alpha$ $sin\alpha$+$cos\beta$  $cos\beta$

Answer

$sin\alpha$ $cos\beta$ - $cos\alpha$  $sin\beta$

Answer

$sin\alpha$ $cos\alpha$+$cos\beta$  $sin\beta$

Question 7

$tg  (\alpha+\beta) $

Accepted Answer

$\frac{tg\alpha + tg\beta}{1-tg\alpha tg\beta}$

Answer

$\frac{tg\alpha+ tg\beta}{tg\alpha -tg\beta}$

Answer

$\frac{tg\alpha + tg\beta}{tg\alpha tg\beta}$

Answer

$\frac{tg\alpha}{tg\beta}$

Question 8

$\cos{107}^{\circ}\cos{17}^{\circ}+\sin{107}^{\circ}\sin{17}^{\circ}$

Accepted Answer

$0$

Answer

$\frac{1}{2}$

Answer

$\frac{\sqrt{7}}{5}$

Answer

$1$

Related quizzes