Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.1 Fundamental Identities - 7.1 Exercises: 39

Answer

C

Work Step by Step

$-\tan x\cos x=-\dfrac {\sin x}{\cos x}\times \cos x=-\sin x=\sin \left( -x\right) \Rightarrow 39\rightarrow C$
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