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 $
$4\rightarrow C$
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 657: 4
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