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

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

A

`-4 sin^(2) alpha`

B

`4 sin^(2) alpha`

C

4

D

`2 sin 2 alpha`

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The correct Answer is:
B
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