Answer
$\frac{\pi}{2}$.
Work Step by Step
Let $\cos^{-1}(0)=x$. Then, $\cos x=0$.
Needless to say, $cos(\frac{\pi}{2})=0$.
Therefore, x= $\frac{\pi}{2}$.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.