Hỏi đáp về Chương I Hàm số lượng giác và Phương trình lượng giác

A. \(\left\{ {\dfrac{{ - \pi }}{2} + k2\pi ;\,\,k\pi } \right\}\)

B. \(\left\{ {\dfrac{{ - \pi }}{2} + k2\pi ;\,\,k2\pi } \right\}\)

C. \(\left\{ {\dfrac{\pi }{2} + k2\pi ;\,\,k\pi } \right\}\)

D. \(\left\{ {\dfrac{\pi }{2} + k2\pi ;\,\, - k2\pi } \right\}\)

A. 2                            

B. 3

C. 4                            

D. 5

A. \(\left\{ {\dfrac{\pi }{{18}};\dfrac{{5\pi }}{{18}};\,\,\dfrac{{13\pi }}{{18}};\dfrac{{17\pi }}{{18}}} \right\}\)

B. \(\left\{ {\dfrac{\pi }{{18}};\dfrac{{5\pi }}{{18}};\,\,\dfrac{{7\pi }}{{18}};\dfrac{{11\pi }}{{18}}} \right\}\)

C. \(\left\{ {\dfrac{{5\pi }}{{18}};\dfrac{{7\pi }}{{18}};\,\,\dfrac{{11\pi }}{{18}};\dfrac{{13\pi }}{{18}}} \right\}\)

D. \(\left\{ {\dfrac{{5\pi }}{{18}};\dfrac{{7\pi }}{{18}};\,\,\dfrac{{13\pi }}{{18}};\dfrac{{17\pi }}{{18}}} \right\}\)

A. \(\left\{ {\dfrac{{ - \pi }}{{12}} + k\pi ;\,\,\dfrac{\pi }{4} + k\pi } \right\}\)

B. \(\left\{ {\dfrac{\pi }{{12}} + k\pi ;\,\,\dfrac{\pi }{4} + k\pi } \right\}\)

C. \(\left\{ {\dfrac{{ - \pi }}{{12}} + k2\pi ;\,\,\dfrac{\pi }{4} + k2\pi } \right\}\)

D. \(\left\{ {\dfrac{{ - \pi }}{{12}} + k\pi ;\,\,\dfrac{{ - \pi }}{4} + k\pi } \right\}\)

A. \(x = \dfrac{\pi }{3} + k\pi \)

B. \(x =  - \dfrac{\pi }{3} + k\pi \)

C. \(x = \dfrac{\pi }{6} + k\pi \)

D. \(x =  - \dfrac{\pi }{6} + k\pi \)

A. \(x = 0\)

B. \(x = \dfrac{\pi }{4}\)

C. \(x = \dfrac{\pi }{2}\)

D. \(x =  - \dfrac{\pi }{4}\)

A. \(T = \left\{ {\dfrac{\pi }{4} + k\pi ,k \in \mathbb{Z}} \right\}\)

B. \(T = \left\{ {\arctan 1 + k\pi ,k \in \mathbb{Z}} \right\}\)

C. \(T = \left\{ {\dfrac{{ - \pi }}{4} + k\pi ,k \in \mathbb{Z}} \right\}\)

D. \(T = \left\{ {1 + k\pi ,k \in \mathbb{Z}} \right\}\)

A. \(T = \left\{ {k2\pi ;\,\,\pi  + k2\pi ,k \in \mathbb{Z}} \right\}\)

B. \(T = \left\{ {k\pi ,k \in \mathbb{Z}} \right\}\)

C. \(T = \left\{ { - \pi  + k\pi ,k \in \mathbb{Z}} \right\}\)

D. Cả A, B, C đều đúng

A. \(T = \left\{ { \pm \dfrac{{2\pi }}{3} + k2\pi ,k \in \mathbb{Z}} \right\}\)

B. \(T = \left\{ { - \dfrac{{2\pi }}{3} + k\pi ,k \in \mathbb{Z}} \right\}\)

C. \(T = \left\{ { \pm \dfrac{\pi }{3} + k2\pi ,k \in \mathbb{Z}} \right\}\)

D. \(T = \left\{ {\dfrac{{2\pi }}{3} + k\pi ,k \in \mathbb{Z}} \right\}\)

A. 2.                            

B. 3.

C. 0.                            

D. 5.

A. \(y = \sin x - \cos x\).

B. \(y = 2\sin x\).

C. \(y = 2\sin \left( { - x} \right)\).

D. \(y =  - 2\cos x\).