A.
\(\left[ \begin{array}{l}
{\rm{x}}\,{\rm{ = }} - \frac{{\rm{\pi }}}{6}{\rm{ + k2\pi }}\\
{\rm{x}}\,{\rm{ = }}\frac{{\rm{\pi }}}{2}{\rm{ + k2\pi }}
\end{array} \right.\left( {{\rm{k}} \in Z} \right)\)
B. \({\rm{x}}\,{\rm{ = }}\frac{{\rm{\pi }}}{6}{\rm{ + k2\pi }}\left( {{\rm{k}} \in Z} \right)\)
C.
\(\left[ \begin{array}{l}
{\rm{x}}\,{\rm{ = }} - \frac{{\rm{\pi }}}{6}{\rm{ + k\pi }}\\
{\rm{x}}\,{\rm{ = }}\frac{{\rm{\pi }}}{2}{\rm{ + k\pi }}
\end{array} \right.\left( {{\rm{k}} \in Z} \right)\)
D.
\(\left[ \begin{array}{l}
{\rm{x}}\,{\rm{ = k2\pi }}\\
{\rm{x}}\,{\rm{ = }}\frac{{\rm{\pi }}}{3}{\rm{ + k2\pi }}
\end{array} \right.\left( {{\rm{k}} \in Z} \right)\)
A
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