Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - Summary Exercises Verifying Trigonometric Identities - Exercises - Page 696: 4


$sec\left( \pi -x\right) =-secx$

Work Step by Step

$sec\left( \pi -x\right) =\dfrac {1}{\cos \left( \pi -x\right) }=\dfrac {1}{\cos \pi \cos x+\sin \pi \sin x}=-\dfrac {1}{\cos x}=-secx$
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