Answer
True.
Work Step by Step
True. Use the identity $sin(-\theta)=-sin\theta$, we have $sin(-\theta)+sin\theta=0$ for any value of $\theta$.
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 6.4 Trigonometric Identities - 6.4 Assess Your Understanding - Page 496: 6
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