Answer
$-1.52$
Work Step by Step
Suppose $\theta = \tan^{-1} (-20)$
This gives: $\tan \theta=-20$
Now, substitute the equation into a calculator (in radian mode).
Therefore, we have $ \tan^{-1} (-20)=-1.52$
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: 27
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