Answer
$-\sin x$
Work Step by Step
$\sin \left( \pi +x\right) =\sin \pi \cos x+\cos \pi \sin x=0\times \cos x+\left( -1\right) \times \sin x=-\sin x$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter 7 - Trigonometric Identities and Equations - 7.3 Sum and Difference Identities - 7.3 Exercises - Page 680: 78
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