#### Answer

$-\sin x$

#### Work Step by Step

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

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$-\sin x$

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