- Phương trình lượng giác bậc cao 1 ẩn - có lời gi...

A $\left[ \matrix{x = {\pi \over 3} + k\pi \hfill \cr x = {\pi \over 6} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

B $\left[ \matrix{x = {\pi \over 3} + k2\pi \hfill \cr x = {\pi \over 6} + k2\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

C $\left[ \matrix{x = - {\pi \over 3} + k\pi \hfill \cr x = - {\pi \over 6} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = - {\pi \over 3} + k2\pi \hfill \cr x = {\pi \over 6} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

A $x = \pi  + k2\pi \,\,\left( {k \in Z} \right)$

B $x = k\pi \,\,\left( {k \in Z} \right)$

C $x = \pi  + k\pi \,\,\left( {k \in Z} \right)$

D $x = k2\pi \,\,\left( {k \in Z} \right)$

A $x =  - {\pi  \over 6} + k2\pi \,\,\,\left( {k \in Z} \right)$

B $x = {\pi  \over 6} + {{k2\pi } \over 3}\,\,\,\left( {k \in Z} \right)$

C $x =  - {\pi  \over 6} + {{k2\pi } \over 3}\,\,\,\left( {k \in Z} \right)$

D $x =  \pm {\pi  \over 6} + {{k2\pi } \over 3}\,\,\,\left( {k \in Z} \right)$

A $x =  \pm {\pi  \over 6} + k\pi \,\,\left( {k \in Z} \right)$

B $x =  \pm {\pi  \over 6} + k2\pi \,\,\left( {k \in Z} \right)$

C $x =  \pm {\pi  \over 3} + k\pi \,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = {\pi \over 6} + k\pi \,\,\left( {k \in Z} \right) \hfill \cr x = {\pi \over 3} + k\pi \,\,\left( {k \in Z} \right) \hfill \cr} \right.$

A $\left[ \matrix{x = \pm {\pi \over 4} + k\pi \hfill \cr x = \arctan {1 \over 3} + k\pi \hfill \cr} \right.\,\,\,\left( {k \in Z} \right)$

B $\left[ \matrix{x = {\pi \over 4} + k2\pi \hfill \cr x = \arctan {1 \over 3} + k\pi \hfill \cr} \right.\,\,\,\left( {k \in Z} \right)$

C $\left[ \matrix{x = {\pi \over 4} + k\pi \hfill \cr x = \arctan {1 \over 3} + k\pi \hfill \cr} \right.\,\,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = - {\pi \over 4} + k\pi \hfill \cr x = - \arctan {1 \over 3} + k\pi \hfill \cr} \right.\,\,\,\left( {k \in Z} \right)$

A $\left[ \matrix{- {1 \over 2} \le m \le {1 \over 2} \hfill \cr 1 \le m \le 2 \hfill \cr} \right.$

B $\left[ \matrix{- {1 \over 3} \le m \le {1 \over 3} \hfill \cr 1 \le m \le 3 \hfill \cr} \right.$

C $\left[ \matrix{- 2 \le m \le - 1 \hfill \cr 0 \le m \le 1 \hfill \cr} \right.$

D $\left[ \matrix{- 1 \le m \le 1 \hfill \cr 3 \le m \le 4 \hfill \cr} \right.$

A $\left[ \matrix{x = {\pi \over {12}} + k2\pi \hfill \cr x = {{11\pi } \over {12}} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

B $\left[ \matrix{x = {\pi \over 6} + k2\pi \hfill \cr x = {{5\pi } \over 6} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

C $\left[ \matrix{x = {\pi \over 3} + k2\pi \hfill \cr x = {{2\pi } \over 3} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = {\pi \over 4} + k2\pi \hfill \cr x = {{3\pi } \over 4} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

A $x =  \pm {{2\pi } \over 3} + k2\pi \,\,\,\left( {k \in Z} \right)$

B $x =  \pm {\pi  \over 2} + k2\pi \,\,\,\left( {k \in Z} \right)$

C $x =  \pm {\pi  \over 3} + k2\pi \,\,\,\left( {k \in Z} \right)$

D $x = {{2\pi } \over 3} + k2\pi \,\,\,\left( {k \in Z} \right)$

A $\left[ \matrix{x = \pi + k2\pi \hfill \cr x = \pm {{4\pi } \over 3} + k4\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

B $\left[ \matrix{x = \pi + k2\pi \hfill \cr x = \pm {{4\pi } \over 3} + k2\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

C $\left[ \matrix{x = {\pi \over 4} + k\pi \hfill \cr x = \pm {\pi \over 3} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = - {\pi \over 4} + k\pi \hfill \cr x = \pm {\pi \over 6} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

A 0

B 1

C 2

D 4

A $\left[ \matrix{m \le 0 \hfill \cr m \ge 1 \hfill \cr} \right.$

B $\left| m \right| \le 1$

C $\left| m \right| \ge 1$

D $m \in R$

A 2

B 0

C 1

D 3

A $x =  \pm {\pi  \over 3} + k2\pi \,\,\left( {k \in Z} \right)$

B $x =  \pm {\pi  \over 3} + {{k\pi } \over 2}\,\,\left( {k \in Z} \right)$

C $x =  \pm {{2\pi } \over 3} + k2\pi \,\,\left( {k \in Z} \right)$

D $x =  \pm {\pi  \over 3} + k\pi \,\,\left( {k \in Z} \right)$

A $\left[ \matrix{x = {\pi \over 4} + k2\pi \hfill \cr x = {{3\pi } \over 4} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

B $x = {{3\pi } \over 4} + k2\pi \,\,\left( {k \in Z} \right)$

C $x = {\pi  \over 4} + k2\pi \,\,\left( {k \in Z} \right)$

D $x =  \pm {\pi  \over 4} + k2\pi \,\,\,\,\left( {k \in Z} \right)$

A $x = {\pi  \over 6} + {{k\pi } \over 2}\,\,\,\left( {k \in Z} \right)$

B $x =  - {\pi  \over 6} + {{k\pi } \over 2}\,\,\,\left( {k \in Z} \right)$

C $x =  \pm {\pi  \over 2} + k\pi \,\,\,\left( {k \in Z} \right)$

D $x =  \pm {\pi  \over 6} + {{k\pi } \over 2}\,\,\,\left( {k \in Z} \right)$

A $x = {\pi  \over 2} + k2\pi \,\,\left( {k \in Z} \right)$

B $x = \pi  + k\pi \,\,\left( {k \in Z} \right)$

C $x = \pi  + k2\pi \,\,\left( {k \in Z} \right)$

D $x =  - {\pi  \over 2} + k2\pi \,\,\left( {k \in Z} \right)$

A $\left[ \matrix{x = - {\pi \over 6} + k2\pi \hfill \cr x = {\pi \over 2} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

B $\left[ \matrix{x = {\pi \over 6} + k2\pi \hfill \cr x = {{3\pi } \over 2} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

C $\left[ \matrix{x = - {\pi \over 3} + k2\pi \hfill \cr x = {{5\pi } \over 6} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = {\pi \over 3} + k2\pi \hfill \cr x = {\pi \over 4} + k2\pi \hfill \cr} \right.\,\,\,\,\left( {k \in Z} \right)$

A $- {1 \over 4} \le a \le {1 \over 4}$

B $- {1 \over 4} \le a < {1 \over 4}$

C $- {1 \over 4} < a \le {1 \over 4}$

D $- {1 \over 4} < a < {1 \over 4}$

A ${\pi  \over 3}$

B ${\pi  \over 3};\pi \,;{{5\pi } \over 3}$

C ${\pi  \over 3};{{5\pi } \over 3}$

D ${{5\pi } \over 3}$

A $\left[ \matrix{x = k2\pi \hfill \cr x = \pm {\pi \over 3} + k2\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

B $\left[ \matrix{x = k\pi \hfill \cr x = \pm {\pi \over 6} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

C $\left[ \matrix{x = {{k\pi } \over 2} \hfill \cr x = \pm {\pi \over 4} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$

D $\left[ \matrix{x = k{{2\pi } \over 3} \hfill \cr x = \pm {{2\pi } \over 3} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)$