Phương trình \(\sin 3x - 4\sin x\cos 2x = 0\) có các nghiệm là:
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.\(\left[ \matrix{x = k{{2\pi } \over 3} \hfill \cr x = \pm {{2\pi } \over 3} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)\)
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.\(\left[ \matrix{x = k{{2\pi } \over 3} \hfill \cr x = \pm {{2\pi } \over 3} + k\pi \hfill \cr} \right.\,\,\left( {k \in Z} \right)\)
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Hóa Học lớp 12
