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: 75

Answer

$-\cos x$

Work Step by Step

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