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 - Page 659: 40



Work Step by Step

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