A \(x = k\pi \)
B \(x =6 k\pi \)
C \(x = {{k\pi } \over 2}\)
D \(x = {\pi \over 4} + k2\pi \)
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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