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If x=2cost+cos2t,y=2 sint-sin2t, then (d...

If `x=2cost+cos2t,y=2 sint-sin2t`, then `(dy)/(dx)` at `t=(pi)/(4)` is

A

`1/sqrt2`

B

`sqrt2`

C

`-(1+sqrt2)`

D

`1-sqrt2`

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The correct Answer is:
D
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