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: 39


$\tan^2 x$

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 $\sec^2 x-1=\tan^2 x$.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.