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$\Rightarrow \sin x=\dfrac{1}{2}$ $\Rightarrow \left[\begin{array}{l} x=\dfrac{\pi}{6}+k2\pi \\ x=\pi-\dfrac{\pi}{6}+k2\pi\end{array} \right .$ $\Rightarrow \left[ \begin{array}{l} x=\dfrac{\pi}{6}+k2\pi \\ x=\dfrac{5\pi}{6}+k2\pi\end{array} \right .(k\in\mathbb Z)$
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