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If cos^-1 x- cos^-1 (y/2)=alpha, then 4x...

If `cos^-1 x- cos^-1 (y/2)=alpha, then 4x^2-4xycosalpha+y^2` is equal to (A) 4 (B) `2sin2alpha` (C) `-4sin^2alpha` (D) `4sin^2alpha`

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