Bài tập 9 trang 41 SGK Đại số & Giải tích 11

A. \(x = \dfrac{\pi }{{12}} + k\dfrac{\pi }{4}\)

B. \(x = \dfrac{\pi }{8} + k\dfrac{\pi }{4}\)

C. \(x = k\dfrac{\pi }{4}\)

D. \(x = \dfrac{\pi }{{24}} + k\dfrac{\pi }{4}\)

A. \(\left[ \begin{array}{l}x = \dfrac{\pi }{4} + k\dfrac{{2\pi }}{3}\\x = \dfrac{{3\pi }}{4} + k2\pi \end{array} \right.\)

B. \(\left[ \begin{array}{l}x =  - \dfrac{\pi }{4} + k2\pi \\x =  - \dfrac{\pi }{{12}} + k\dfrac{{2\pi }}{3}\end{array} \right.\)

C. \(\left[ \begin{array}{l}x = \dfrac{\pi }{4} + k2\pi \\x = \dfrac{{4\pi }}{9} + k\dfrac{{2\pi }}{3}\end{array} \right.\)

D. \(\left[ \begin{array}{l}x = \dfrac{\pi }{4} + k2\pi \\x = \dfrac{\pi }{{12}} + k\dfrac{{2\pi }}{3}\end{array} \right.\)

A. \(x = k\pi ;\,\,x =  - \dfrac{\pi }{6} + k2\pi ;\,\,x = \dfrac{{7\pi }}{6} + k2\pi \)

B. \(x = k2\pi ;\,\,x =  - \dfrac{{2\pi }}{3} + k2\pi \)

C. \(x = k\pi ;\,\,x =  - \dfrac{\pi }{3} + k2\pi ;\,\,x = \dfrac{{4\pi }}{3} + k2\pi \)

D. \(x = k\pi ;\,\,x = \dfrac{\pi }{3} + k2\pi ;\,\,x = \dfrac{{2\pi }}{3} + k2\pi \)

A. \(y = {x^2} - {\mathop{\rm s}\nolimits} {\rm{in4}}x\)

B. \(y = \dfrac{{\sin x - \cot x}}{x}\)

C. \(y = {x^4} - \cos x\)

D. \(y = {x^2}\tan x\)

A. \(4\)                                  

B. \(6\)

C. \(5\)                                  

D. \(3\)

A. \(\,x = \dfrac{\pi }{8} + k\dfrac{\pi }{2};\,\,x = \dfrac{\pi }{4} + k\pi \)

B. \(x = k2\pi ;\,\,x = \dfrac{\pi }{2} + k2\pi \)

C. \(x = k\pi ;\,\,x = \dfrac{\pi }{4} + k\pi \)

D. \(x = k\pi ;\,\,x = k\dfrac{\pi }{2}\)

A. \(2\cos x - 1 = 0\)

B. \(2\cos x + 1 = 0\)

C. \(2\sin x + 1 = 0\)

D. \(2\sin x - \sqrt 3  = 0\)

A. \(m < 1 - \sqrt 3 \)

B. \(m > 1 + \sqrt 3 \)

C. \(1 - \sqrt 3  \le m \le 1 + \sqrt 3 \)

D. \( - \sqrt 3  \le m \le \sqrt 3 \)

A. \(\mathbb R\backslash \left\{ {k\pi ,k \in Z} \right\}\)

B. \(\mathbb R\)

C. \(\mathbb R\backslash \left\{ {{{k\pi } \over 2},k \in Z} \right\}\)

D. \([4;3]\)