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If x=sin tcos 2t,y= cos tsin 2t ,then " ...

If `x=sin tcos 2t,y= cos tsin 2t ,then " at " t= (pi)/(4) ,(dy)/(dx) `

A

` (-1)/(2)`

B

` (1)/(2)`

C

` -2`

D

` 2`

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The correct Answer is:
B
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