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: 40

Answer

A

Work Step by Step

$\sec^{2}x-1=\dfrac {1}{\cos ^{2}x}-1=\dfrac {1-\cos ^{2}x}{\cos ^{2}x}=\dfrac {\sin ^{2}x}{\cos ^{2}x}\Rightarrow 40\rightarrow A$
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.