Question 1

$\cos^{2}20^{0}+ tg 10^{0} tg 100^{0}+\cos^{2}70^{0}=$

Accepted Answer

$0$

Answer

$2$

Answer

$-1$

Answer

$1$

Question 2

$\frac{\sin\frac{\pi}{7}\sin\frac{2\pi}{7}\sin\frac{4\pi}{7}}{\sin\frac{6\pi}{7}\sin\frac{3\pi}{7}\sin\frac{5\pi}{7}}=$

Accepted Answer

$1$

Answer

$2$

Answer

$0$

Answer

$-1$

Question 3

$A=\frac{tg\left( \pi-x  \right) }{ctg\left( \pi-x  \right)-tgx}$

Accepted Answer

$A\in(0,1) $

Answer

$A\in\left(- \frac{1}{2},1  \right)  $

Answer

$A\in(-1,0) $

Answer

A\in(-1,-\frac{1}{2})

Question 4

A\in(-1,-\frac{1}{2})

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 5

$\cos1230^{0}=$

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 6

$tg1680^{0}=$

Accepted Answer

Answer

$-1$

Answer

$1$

Answer

A\in(-1,-\frac{1}{2})

Question 7

$ctg\frac{17\pi}{3}=$

Accepted Answer

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

Answer

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

Answer

$-\sqrt{3}$

Answer

$\sqrt{3}$

Question 8

$\cos\frac{43\pi}{6}=$

Accepted Answer

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

Answer

$-\frac{1}{2}$

Answer

$\frac{1}{2}$

Answer

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

Question 9

$\sin\frac{35\pi}{4}=$

Accepted Answer

Answer

$1$

Answer

$-1$

Answer

A\in(-1,-\frac{1}{2})

Question 10

$\cos(α-270^{0} )=$

Accepted Answer

$-sinα$

Answer

$cosα$

Answer

$sinα$

Answer

$-cosα$

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