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: 20


$sec^{2}\theta $

Work Step by Step

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