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If Cos^(-1)x-Cos^(-1)(y/2)=alpha" then "...

If `Cos^(-1)x-Cos^(-1)(y/2)=alpha" then "4x^(2)-4xycosalpha+y^(2)=`

A

`-4sin^(2)alpha`

B

`4sin^(2)alpha`

C

4

D

`2 sin 2alpha`

Text Solution

Verified by Experts

The correct Answer is:
B
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