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Ifcos^(-1) x - cos ^(-1) (y)/(2) =alpha...

If`cos^(-1) x - cos ^(-1) (y)/(2) =alpha` then `4x^(2) -4xy cos alpha+ y^(3)` is equzal to

A

`2 sin 2 alpha`

B

4

C

`4 sin ^(2) alpha`

D

`-4 sin ^(2) alpha`

Text Solution

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The correct Answer is:
C
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