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If x = 2 cos t - cos 2t, y = 2 sin t - s...

If `x = 2 cos t - cos 2t`, `y = 2 sin t - sin 2t`, then the value of `d^2y/dx^2` at `t=pi//2` is

A

`3//2`

B

`-3//2`

C

`5//2`

D

`-5//2`

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