Giải phương trình \({ \rm{co}}{{ \rm{s}}^3}x - { \rm{si}}{{ \rm{n}}^3}x = { \rm{cos}}2x \)
A.\(x = k2\pi ,\;x = \frac{\pi }{2} + m\pi ,\;x = \frac{\pi }{4} + l\pi \)
B.\(x = k2\pi ,\;x = \frac{\pi }{2} + m2\pi ,\;x = \frac{\pi }{4} + l2\pi \)
C.\(x = k2\pi ,\;x = \frac{\pi }{2} + m2\pi ,\;x = \frac{\pi }{4} + l\pi \)
D.\(x = k\pi ,\;x = \frac{\pi }{2} + m\pi ,\;x = \frac{\pi }{4} + l\pi \)
A.\(x = k2\pi ,\;x = \frac{\pi }{2} + m\pi ,\;x = \frac{\pi }{4} + l\pi \)
B.\(x = k2\pi ,\;x = \frac{\pi }{2} + m2\pi ,\;x = \frac{\pi }{4} + l2\pi \)
C.\(x = k2\pi ,\;x = \frac{\pi }{2} + m2\pi ,\;x = \frac{\pi }{4} + l\pi \)
D.\(x = k\pi ,\;x = \frac{\pi }{2} + m\pi ,\;x = \frac{\pi }{4} + l\pi \)
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