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If cot^(-1)x-"cos"^(-1)(y)/(2)=alpha, t...

If `cot^(-1)x-"cos"^(-1)(y)/(2)=alpha`, then `4x^(2)-4xy cos alpha+y^(2)` is equal to :

A

`-4sin^(2)alpha`

B

`4sin^(2)alpha`

C

4

D

`2sin^(2)alpha`

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The correct Answer is:
B
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