Bài tập 1.39 trang 40 SBT Toán 11

A. \( - 1 \le m \le 1\)             

B. \(\dfrac{4}{3} \le m \le 2\)

C. \( - 2 \le m \le \dfrac{4}{3}\)         

D. \(\dfrac{4}{3} \le m \le 3\)

A. \(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{7\pi }}{6} + k2\pi \end{array} \right.\)

B. \(\left[ \begin{array}{l}x =  - \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{7\pi }}{6} + k2\pi \end{array} \right.\)

C. \(\left[ \begin{array}{l}x =  - \dfrac{\pi }{6} + k2\pi \\x = -\dfrac{{7\pi }}{6} + k2\pi \end{array} \right.\)

D. \(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \end{array} \right.\)

A. \(x = \dfrac{\pi }{{20}} + k\dfrac{\pi }{5};\,x = \dfrac{\pi }{4} + k\pi \)

B. \(x = \dfrac{\pi }{{20}} + k\dfrac{\pi }{5};\,x = \dfrac{\pi }{4} + k\dfrac{\pi }{2}\)

C. \(x = \dfrac{\pi }{4} + k\pi ;\,x = \dfrac{\pi }{{20}} + k\dfrac{{2\pi }}{5}\)

D. \(x = k\pi ;\,x = \dfrac{\pi }{{10}} + k\dfrac{\pi }{5}\)

A. \(x = \dfrac{\pi }{2} + k2\pi \)

B. \(x = \pi  + k2\pi \)

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

D. \(x = k2\pi \)

A. \(x = {40^0} + k{180^0}\)

B. \(x = {40^0} + k{90^0}\)

C. \(x = {40^0} + k{45^0}\)

D. \(x = {80^0} + k{180^0}\)

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

B. \(x = \dfrac{\pi }{6} + k2\pi ;\,\,\,x = \dfrac{{5\pi }}{6} + k2\pi \)

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

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

A. \(y = \sin x\)                    

B. \(y = \cos x\)

C. \(y = \cot x\)                    

D. \(y = \tan x\)

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

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

C. \(x =  - \dfrac{\pi }{6} + k2\pi ;\,\,x = \dfrac{\pi }{2} + k2\pi \)

D. \(x = \dfrac{\pi }{6} + k2\pi ;\,\,x = \dfrac{{5\pi }}{6} + k2\pi \)

A. \(9 - \cot x = 0\)

B. \(2\tan x + 9 = 0\)

C. \(1 - 4\sin x = 0\)

D. \(5 + 4\cos x = 0\)