Đề thi HK2 môn Toán 10 Trường THPT Dương Đình Nghệ...

A. $S = \left( { - \infty ;2} \right)$

B. $S = \left( { - \infty ;2} \right]$

C. $S = \left( {2; + \infty } \right)$

D. $S = \left[ {2; + \infty } \right)$

A. \(\cot \alpha  = \frac{1}{{\sqrt 2 }}\\)

B. \(\cot \alpha  = \frac{-1}{{\sqrt 2 }}\\)

C. $\cot \alpha  = \frac{1}{2}$

D. $\cot \alpha  = \frac{-1}{2}$

A. $\left( { - \infty ;\frac{3}{2}} \right)$

B. $\left( {\frac{3}{2}; + \infty } \right)$

C. $\left( { - \infty ;\frac{3}{2}} \right]$

D. $\left[ {\frac{3}{2}; + \infty } \right)$

A. ${\sin ^2}x + {\cos ^2}2x = 1$

B. ${\sin ^2}2x + {\cos ^2}x = 1$

C. ${\sin ^2}2x + {\cos ^2}2x = 2$

D. ${\sin ^2}x + {\cos ^2}x = 1$

A. $S = \left( { - \infty ; - 3} \right] \cup \left[ {2; + \infty } \right)$

B. $S = \left( { - 3;2} \right)$

C. $S = \left[ {3;2} \right]$

D. $S = \left( { - \infty ;3} \right) \cup \left( {2; + \infty } \right)$

A. (5; -1)

B. (1; -5)

C. (1; 5)

D. (5; 1)

A. $\cos \left( { - \alpha } \right) =  - \cos \alpha$

B. $\cos \left( {\pi  + \alpha } \right) =  - \cos \alpha$

C. $\cos \left( {\frac{\pi }{2} - \alpha } \right) = \sin \alpha$

D. $\cos \left( {\frac{\pi }{2} + \alpha } \right) =  - \sin \alpha$

A. R = 3

B. $R = \frac{3}{5}$

C. R = 1

D. R = 15

A. $\frac{{{x^2}}}{{100}} + \frac{{{y^2}}}{{64}} = 1$

B. $\frac{{{x^2}}}{{81}} + \frac{{{y^2}}}{{64}} = 1$

C. $\frac{{{x^2}}}{{25}} + \frac{{{y^2}}}{{16}} = 1$

D. $\frac{{{x^2}}}{{100}} + \frac{{{y^2}}}{{36}} = 1$

A. 3

B. 4

C. 5

D. 6