Answer
Not one-to-one.
Work Step by Step
By using the horizontal line test, since $y=0$ intersect the graph $f(x)$ at $(-1,0)$ and $(1,0)$, then $f(x) $ is not one-to-one.
Thomas' Calculus 13th Edition
by Thomas Jr., George B.
Published by
Pearson
ISBN 10:
0-32187-896-5
ISBN 13:
978-0-32187-896-0
Chapter 7: Transcendental Functions - Section 7.1 - Inverse Functions and Their Derivatives - Exercises 7.1 - Page 372: 2
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