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If cos^(-1)x-cos^(-1)y/2=alpha,t h e n4x...

If `cos^(-1)x-cos^(-1)y/2=alpha,t h e n4x^2-4x ycosalpha+y^2` is equal to 4 (b) `2sin^2alpha` (c) `-4sin^2alpha` (d) `4sin^2alpha`

A

`2 sin 2 alpha`

B

`4`

C

`4 sin^(2)alpha`

D

`-4sin^(2)alpha`

Text Solution

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The correct Answer is:
C
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