\({\cos ^3}x + 2\sin x{\cos ^2}x - 3{\sin ^3}x = 0...

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

A \(x = \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\)

B \(x = \frac{\pi }{4} + k2\pi \left( {k \in Z} \right)\)

C \(x =  - \frac{\pi }{4} + k\pi \left( {k \in Z} \right)\)

D \(x =  - \frac{\pi }{4} + k2\pi \left( {k \in Z} \right)\)