#### 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 $
$4\rightarrow C$

Published by
Pearson

ISBN 10:
013421742X

ISBN 13:
978-0-13421-742-0

$4\rightarrow C$

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