Answer
$ -1 $
Work Step by Step
$-4tan^{-1}(x)=\pi \Longrightarrow tan^{-1}(x)=-\frac{\pi}{4} \Longrightarrow x=tan(-\frac{\pi}{4})=-1 $
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Chapter 6 - Analytic Trigonometry - Section 6.1 The Inverse Sine, Cosine, and Tangent Functions - 6.1 Assess Your Understanding - Page 474: 66
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