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If $y=\sin ^{ 2 }{ t } $, then $\cfrac { { d }^{ 2 }y }{ d{ t }^{ 2 } } =$

A

$-2$

B

$\cos { \left( 2t \right) } $

C

$2\cos { \left( 2t \right) } $

D

$2\sin { t } \cos { t } $

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