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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

B

`2 sin^(2) alpha`

C

`-4 sin^(2) alpha`

D

`4 sin^(2) alpha`

Text Solution

Verified by Experts

The correct Answer is:
d
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