Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 7 - Trigonometric Identities and Equations - Quiz: 4

Answer

$-\cos \theta $

Work Step by Step

$\cos \left( 180-\theta \right) =\cos {180}\cos \theta +\sin {180}\sin \theta =-1\times \cos \theta +0\times \sin \theta =-\cos \theta $
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