Question 1

$1. \ sin$ $ 390°=?$

Accepted Answer

$\frac{1}{2}$

Answer

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

Answer

1

Answer

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

Question 2

$2.\   sin$ $420°=?$

Accepted Answer

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

Answer

1

Answer

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

Answer

$\frac{{1}}{2}$

Question 3

\cos

(-720°)=?

Accepted Answer

Answer

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

Answer

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

Answer

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

Question 4

$4.\ tg$ $750°=?$

Accepted Answer

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

Answer

$-\frac{\sqrt{3}}{3}$

Answer

$\sqrt{3}$

Answer

$-\sqrt{3}$

Question 5

\cos

(-720°)=?

Accepted Answer

Answer

&#36;1&#36;

Answer

$-\frac{\sqrt{3}}{3}$

Answer

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

Question 6

$6.  \ sin$ (-$\frac{9π}{4})$

Accepted Answer

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

Answer

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

Answer

-1

Answer

1

Question 7

$7.\$cos$ $$\frac{31π}{2}$

Accepted Answer

$0$

Answer

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

Answer

$1$

Answer

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

Question 8

$8.  \  5·sin$$\frac{π}{2}$+4·cos$0$-3·sin$\frac{3π}{2}$+cos$π$=?

Accepted Answer

$11$

Answer

$9$

Answer

$7$

Answer

$1$

Question 9

$9.   \$ 2·sin$(-\frac{π}{4})$+cos²$(-\frac{π}{6})$-sin$(-\frac{4π}{3})$=?

Accepted Answer

$-\sqrt{2}+\frac{3}{4}-\frac{\sqrt{3}}{2}$

Answer

$-\sqrt{2}-\frac{3}{4}+\frac{\sqrt{3}}{2}$

Answer

$\sqrt{2}-\frac{3}{4}+\frac{\sqrt{3}}{2}$

Answer

$\sqrt{2}+\frac{3}{4}-\frac{\sqrt{3}}{2}$

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