Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 5 - Section 5.5 - Inverse Trigonometric Functions and Their Graphs - 5.5 Exercises - Page 445: 39



Work Step by Step

$\tan^{-1}(\tan(\frac{\pi}{4}))= \tan^{-1}(1)$ Let $\tan^{-1}(1)=y$. Then, $\tan y= 1= \tan\frac{\pi}{4}$ $⇒y=\frac{\pi}{4}$
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