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Given $y=x \cdot \arccos { x } -2\sqrt{ ( { 1-x }^{ 2 } )} ,$ find $\cfrac {dy}{dx}$.

A

$\arccos { x } $

B

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

C

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

D

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

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