Answer
$-\dfrac{\pi}{4}$
Work Step by Step
Suppose $\theta = \tan^{-1} (-1)$
This gives: $\tan \theta=1$
Now, $\theta = \tan^{-1} (-1)=-\dfrac{\pi}{4}$
Therefore, $\tan^{-1} (-1)=-\dfrac{\pi}{4}$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter 4 - Section 4.7 - Inverse Trigonometric Functions - Exercise Set - Page 626: 16
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