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 - Page 659: 77


$sec^{2}\theta $

Work Step by Step

$\sin ^{2}\left( -\theta \right) +\tan ^{2}\left( -\theta \right) +\cos ^{2}\left( -\theta \right) =1+\tan ^{2}\left( -\theta \right) =\dfrac {1}{\cos ^{2}\left( -\theta \right) }=\dfrac {1}{\cos ^{2}\theta }=sec^{2}\theta $
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