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Find the derivative of $\DeclareMathOperator{\arcsec}{arcsec} y=\arcsec( 5x ) $ for all $x > 0$.

A

$\cfrac{1}{( x\sqrt{( { 25x }^{ 2 }-1 ) })} $

B

$\cfrac{-1}{( x\sqrt{( { 25x }^{ 2 }-1 ) })} $

C

$\cfrac{1}{( 5x\sqrt{( { 5x }^{ 2 }-1 ) }) }$

D

$\cfrac{1}{( x\sqrt{( { 5x }^{ 2 }-1 ) }) }$

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