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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 -4xycos alpha +y^2` is equal a)`2 sin alpha` b)4 c)`4 sin^2alpha` d)`-4 sin^2alpha`

A

`2 sin alpha`

B

4

C

`4 sin^2alpha`

D

`-4 sin^2alpha`

Text Solution

Verified by Experts

The correct Answer is:
C
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