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If $y=\sec ^{ 2 }{ x } ,$ find $\dfrac{dy}{dx}$.

A

$2\sec { x } $

B

$\sec { x\tan { x } } $

C

${ ( \sec { x } \tan { x } ) }^{ 2 }$

D

$2\sec ^{ 2 }{ x } \tan { x } $

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