\(\Leftrightarrow\left[{}\begin{matrix}x+3=arcsin\left(\dfrac{2}{3}\right)+k2\pi\\x+3=\pi-arcsin\left(\dfrac{2}{3}\right)+k2\pi\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}x=-3+arcsin\left(\dfrac{2}{3}\right)+k2\pi\\x=\pi-3-arcsin\left(\dfrac{2}{3}\right)+k2\pi\end{matrix}\right.\)