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

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

A

`2 sin 2alpha`

B

4

C

`4 sin^(2) alpha`

D

`-4sin^(2) alpha`

Text Solution

Verified by Experts

The correct Answer is:
C, D
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