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: 43

Answer

B

Work Step by Step

$\cos ^{2}x=\dfrac {1}{\dfrac {1}{\cos ^{2}x}}=\dfrac {1}{sec^{2}x}\Rightarrow 43\rightarrow B$
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