Giải phương trình \(2{\sin ^2}2x + \sin 7x - 1 = \sin x\).
A.\(x = - \dfrac{\pi }{{18}} + \dfrac{{k\pi }}{3}\), \(x = \dfrac{{5\pi }}{{18}} + \dfrac{{k2\pi }}{9}\).
B.\(x = \pm \dfrac{\pi }{{18}} + {{k2\pi }}\), \(x = \dfrac{{5\pi }}{{18}} + \dfrac{{k2\pi }}{3}\).
C.\(x = \dfrac{\pi }{8} + \dfrac{{k\pi }}{4}\), \(x = \dfrac{\pi }{{18}} + \dfrac{{k2\pi }}{3}\), \(x = \dfrac{{5\pi }}{{18}} + \dfrac{{k2\pi }}{3}\).
D.\(x = \dfrac{\pi }{8} + \dfrac{{k\pi }}{4}\), \(x = \dfrac{\pi }{{18}} + \dfrac{{k\pi }}{18}\), \(x = - \dfrac{{5\pi }}{{18}} + \dfrac{{k\pi }}{3}\).
A.\(x = - \dfrac{\pi }{{18}} + \dfrac{{k\pi }}{3}\), \(x = \dfrac{{5\pi }}{{18}} + \dfrac{{k2\pi }}{9}\).
B.\(x = \pm \dfrac{\pi }{{18}} + {{k2\pi }}\), \(x = \dfrac{{5\pi }}{{18}} + \dfrac{{k2\pi }}{3}\).
C.\(x = \dfrac{\pi }{8} + \dfrac{{k\pi }}{4}\), \(x = \dfrac{\pi }{{18}} + \dfrac{{k2\pi }}{3}\), \(x = \dfrac{{5\pi }}{{18}} + \dfrac{{k2\pi }}{3}\).
D.\(x = \dfrac{\pi }{8} + \dfrac{{k\pi }}{4}\), \(x = \dfrac{\pi }{{18}} + \dfrac{{k\pi }}{18}\), \(x = - \dfrac{{5\pi }}{{18}} + \dfrac{{k\pi }}{3}\).
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Hóa Học lớp 12
