Answer
Please see below.
Work Step by Step
Please note that the graph of the function $y=-2\tan^{-1}x$ (the red graph) is the graph of the function $y=\tan^{-1}x$ (the blue graph) reflected about the $x$-axis and vertically stretched by $2$.
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 628: 112
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