Precalculus (6th Edition)

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

Chapter 7 - Trigonometric Identities and Equations - 7.2 Verifying Trigonometric Identities - 7.2 Exercises - Page 666: 8


$sec\theta $

Work Step by Step

$sec\left( -\theta \right) =\dfrac {1}{\cos \left( -\theta \right) }=\dfrac {1}{\cos \theta }=sec\theta $ ( Becouse cosine is even function)
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