Answer
$$\sin(-\theta)=-\sin\theta$$
Work Step by Step
From the Negative-Angle Identities, we know that
$$\sin(-\theta)=-\sin\theta$$
Therefore, we should fill in the blank with $-\sin\theta$.
Trigonometry (10th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
0321671775
ISBN 13:
978-0-32167-177-6
Chapter 5 - Trigonometric Identities - Section 5.1 Fundamental Identities - 5.1 Exercises - Page 194: 21
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