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

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

A

`-2`

B

2

C

`1/2`

D

`-1/2`

Verified by Experts

The correct Answer is:

C

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