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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-sqrt(2)`

B

`-(1+sqrt(2))`

C

`sqrt(2)`

D

`1//sqrt(2)`

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