Đề thi HK2 môn Toán 10 Trường THPT Dương Đình Nghệ - Thanh Hóa năm 2018

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. \({x^2} + {y^2} - 4 = 0\)

B. \(2{x^2} + {y^2} - 4 = 0\)

C. \({x^2} + 2{y^2} - 4 = 0\)

D. \({x^2} + {y^2} + 4 =)0\]

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. \(\sin 2\alpha  = 2\sin \alpha \)

B. \(\cos 2\alpha  = {\cos ^2}\alpha  - {\sin ^2}\alpha \)

C. \({\left( {\sin \alpha  + \cos \alpha } \right)^2} = 1 + 2\sin 2\alpha \)

D. \(\cos 2\alpha  = 1 - 2{\cos ^2}\alpha \)

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