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A particle moves in the xy-plane according to the parametric equations $x( t ) =\tan { ( 4t ) } $ and $y( t ) =\cos { (2t) }$.

Find the acceleration vector at $t=\pi /2.$

A

$<0,4>$

B

$<0,-4>$

C

$<4,-4>$

D

$<4,4>$

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