Evaluate the following expressions. Your answer must be an angle $-\pi/2 \le \theta \le \pi$ in radians, written as a multiple of $\pi$. Note that $\pi$ is already provided in the answer so you simply have to fill in the appropriate multiple. E.g. if the answer is $\pi/2$ you should enter 1/2. Do not use decimal answers. Write the answer as a fraction or integer.
$\sin^{-1}(\sin((2\pi/3))$ = $\pi$
$\sin^{-1}(\sin(-7\pi/4))$= $\pi$
$\cos^{-1}(\cos(2\pi/3))$= $\pi$
$\cos^{-1}(\cos(3\pi/4))$= $\pi$