\(2{\sin ^2}x - 3\sin x + 1 = 0\)

Câu hỏi: \(2{\sin ^2}x - 3\sin x + 1 = 0\)

A \(\left[ {\begin{array}{*{20}{l}}{x = \dfrac{\pi }{2} + k\pi }\\{x = \dfrac{\pi }{6} + k2\pi }\\{x = \dfrac{{5\pi }}{6} + k2\pi }\end{array}} \right.{\mkern 1mu} {\mkern 1mu} \left( {k \in Z} \right)\)   

B \(\left[ \begin{array}{l}x = \dfrac{\pi }{2} + k\pi \\x =  \pm \dfrac{\pi }{6} + k2\pi \end{array} \right.{\mkern 1mu} {\mkern 1mu} \left( {k \in Z} \right)\)  

C \(\left[ \begin{array}{l}x = \dfrac{\pi }{2} + k2\pi \\x =  \pm \dfrac{\pi }{6} + k2\pi \end{array} \right.{\mkern 1mu} {\mkern 1mu} \left( {k \in Z} \right)\)

D \(\left[ \begin{array}{l}x = \dfrac{\pi }{2} + k\pi \\x =  \pm \dfrac{\pi }{6} + k\pi \end{array} \right.{\mkern 1mu} {\mkern 1mu} \left( {k \in Z} \right)\)