Giải phương trình \({\sin ^2}x = \sin 3x + \cos x\left( {\cos x - 1} \right)\)
A.\(x = \frac{\pi }{4} + k\pi;\,\,x = - \frac{\pi }{2} + k2\pi ;\,\,x = \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
B.\(x = \frac{\pi }{4} + k\pi ;\,\,x = \frac{\pi }{2} + k\pi ;\,\,x = \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
C.\(x = \frac{\pi }{3} + k\pi ;\,\,x = - \frac{\pi }{2} + k2\pi ;\,\,x = - \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
D.\(x = \frac{\pi }{6} + k\pi ;\,\,x = - \frac{\pi }{2} + k\pi ;\,\,x = \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
A.\(x = \frac{\pi }{4} + k\pi;\,\,x = - \frac{\pi }{2} + k2\pi ;\,\,x = \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
B.\(x = \frac{\pi }{4} + k\pi ;\,\,x = \frac{\pi }{2} + k\pi ;\,\,x = \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
C.\(x = \frac{\pi }{3} + k\pi ;\,\,x = - \frac{\pi }{2} + k2\pi ;\,\,x = - \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
D.\(x = \frac{\pi }{6} + k\pi ;\,\,x = - \frac{\pi }{2} + k\pi ;\,\,x = \frac{{2k\pi }}{3}\,\,\left( {k \in Z} \right)\)
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Hóa Học lớp 12
