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 $\sec^2 x-1=\tan^2 x$.
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
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: 39
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