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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

`-(+sqrt2)`

B

`1-sqrt2`

C

`1/sqrt2`

D

`sqrt2`

Text Solution

Verified by Experts

The correct Answer is:
B
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