Answer
$ \pi$
Work Step by Step
$cos^{-1}(tan\frac{3\pi}{4})=cos^{-1}(-1)=\pi$.
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: 19
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