Giải phương trình \(\sin x = \sin \frac{\pi }{3}\).

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

B. \(\left[ \begin{array}{l}
x = \frac{\pi }{3} + k\pi \\
x = \frac{{2\pi }}{3} + k\pi 
\end{array} \right.,k \in Z.\)

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

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