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: 39

Answer

$\tan^2 x$

Work Step by Step

Use the identity on page 655, $\tan^2x+1=\sec^2x$, and subtract $1$ from both sides: $\tan^2x=\sec^2x-1$ So $\sec^2 x-1=\tan^2 x$.
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