Answer
$\dfrac{\pi}{2}$
Work Step by Step
We know that since $\cos{(\frac{\pi}{2})}=0$, then by the definition of the inverse function: $\cos^{-1}{(0)}=\frac{\pi}{2}$. (because it is in the right domain)
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Analytic Trigonometry - Chapter Review - Review Exercises - Page 505: 2
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