Answer
$$x =\tan(1) \approx 1.5574$$
Work Step by Step
Given $$\tan^{-1}x=1$$
\begin{align*}
\tan^{-1}x&=1\\
\tan\tan^{-1}x&=\tan(1)\\
x&=\tan(1)\\
& \approx 1.5574
\end{align*}
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Chapter 6 - Inverse Functions - Review - Exercises - Page 505: 19
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