If x=2 cos t+cos 2t and y=2 sin t-sin2t,...

If `x=2 cos t+cos 2t` and `y=2 sin t-sin2t`, then the value of `(dy)/(dx)` at `t=(pi)/(4)` is -

A

`-(sqrt(2)+1)`

B

`sqrt(2)`

C

`sqrt(2)-1`

D

`1-sqrt(2)`

Verified by Experts

The correct Answer is:

D

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