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: 4

Answer

$4\rightarrow C$

Work Step by Step

$\tan ^{2}x+1=\dfrac {\sin ^{2}x}{\cos ^{2}x}+1=\dfrac {\sin ^{2}x+\cos ^{2}x}{\cos ^{2}x}=\dfrac {1}{\cos ^{2}x}=sec^{2}x\Rightarrow $ $4\rightarrow C$
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