Precalculus (6th Edition)

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: 97

Answer

$=\dfrac {\pi }{4}$

Work Step by Step

$\tan ^{-1}\left( \tan x\right) =x\Rightarrow \tan ^{-1}\left( \tan \dfrac {\pi }{4}\right) =\dfrac {\pi }{4}$
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