Answer
$\frac{\pi}{7}$
Work Step by Step
$cos^{-1}(cos\frac{15\pi}{7})=cos^{-1}(cos\frac{\pi}{7})=\frac{\pi}{7}$.
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: 12
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