$\sin(x)=\frac{1}{3}$

$x=\sin^{-1}\left(\frac{1}{3}\right)$

$x ≈ 0.340$
There is more than one solution. Sketch a unit circle.
Verify that $\sin\left(x\right)=\sin\left(\pi−x\right)$.
Use that fact to determine the other solution.