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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

`2sin2alpha`

Text Solution

Verified by Experts

The correct Answer is:
B
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