Answer
$\frac{\pi}{2}$
Work Step by Step
THE QUESTION IS: $\cos^{-1} x= 0$
On the unit circle, we know the cosine value is 0 when it is at $\frac{\pi}{2}$ or $\frac{3\pi}{2}$.
Verifying with a calculator, we find the answer is $\frac{\pi}{2}$.
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: 8
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