#### Answer

$-\cos x$

#### Work Step by Step

$\sin \left( 270-x\right) =\sin 270\cos x-\cos 270\sin x=-1\times \cos x-0\times \sin x=-\cos x$

Published by
Pearson

ISBN 10:
013421742X

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

$-\cos x$

$\sin \left( 270-x\right) =\sin 270\cos x-\cos 270\sin x=-1\times \cos x-0\times \sin x=-\cos x$

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