Answer
$\pi$
Work Step by Step
We know that $f(f^{-1}(x))=x$.
Hence,
$\tan\left(\tan^{-1}(\pi)\right)=\pi$
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 7 - Trigonometry and Periodic Functions - 7.1 The Inverse Sine, Cosine, and Tangent Functions - 7.1 Assess Your Understanding - Page 451: 57
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