Answer
A
Work Step by Step
$\sec^{2}x-1=\dfrac {1}{\cos ^{2}x}-1=\dfrac {1-\cos ^{2}x}{\cos ^{2}x}=\dfrac {\sin ^{2}x}{\cos ^{2}x}\Rightarrow 40\rightarrow A$
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 - 7.1 Fundamental Identities - 7.1 Exercises - Page 659: 40
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