Precalculus (6th Edition)

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: 78

Answer

$-\sin x$

Work Step by Step

$\sin \left( \pi +x\right) =\sin \pi \cos x+\cos \pi \sin x=0\times \cos x+\left( -1\right) \times \sin x=-\sin x$
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