Answer
$\dfrac {3\pi }{4}$
Work Step by Step
$\arccos \left( \cos x\right) =x\Rightarrow \arccos \left( \cos \dfrac {3\pi }{4}\right) =\dfrac {3\pi }{4}$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 7 - Trigonometric Identities and Equations - Chapter 7 Test Prep - Review Exercises - Page 738: 95
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