Giải phương trình: \(4{\sin ^2}x + 12\sin x - 7 = 0.\)
A.\(S = \left\{ {\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
B.\(S = \left\{ {-\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
C.\(S = \left\{ {\dfrac{\pi }{6} + k2\pi ;-\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
D.\(S = \left\{ {-\dfrac{\pi }{6} + k2\pi ;-\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
A.\(S = \left\{ {\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
B.\(S = \left\{ {-\dfrac{\pi }{6} + k2\pi ;\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
C.\(S = \left\{ {\dfrac{\pi }{6} + k2\pi ;-\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
D.\(S = \left\{ {-\dfrac{\pi }{6} + k2\pi ;-\dfrac{{5\pi }}{6} + k2\pi } \right\}.\)
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Hóa Học lớp 12
