Giải phương trình: \(2{\sin ^2}x - \sin x - 1 = 0\)
A.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \\x = \dfrac{\pi }{2} + k\pi \end{array} \right.\)
B.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \\x = k2\pi \end{array} \right.\)
C.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k\pi \\x = \dfrac{{5\pi }}{6} + k\pi \\x = \dfrac{\pi }{2} + k\pi \end{array} \right.\)
D.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \\x = \dfrac{\pi }{2} + k2\pi \end{array} \right.\)
A.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \\x = \dfrac{\pi }{2} + k\pi \end{array} \right.\)
B.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \\x = k2\pi \end{array} \right.\)
C.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k\pi \\x = \dfrac{{5\pi }}{6} + k\pi \\x = \dfrac{\pi }{2} + k\pi \end{array} \right.\)
D.\(\left[ \begin{array}{l}x = \dfrac{\pi }{6} + k2\pi \\x = \dfrac{{5\pi }}{6} + k2\pi \\x = \dfrac{\pi }{2} + k2\pi \end{array} \right.\)
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