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જોcos^-1 x-cos^-1 (y/2)= alpha તો 4x^2-...

જો`cos^-1 x-cos^-1 (y/2)= alpha ` તો `4x^2-4xy cos alpha +y^2`=____________

A

`-4sin^2 alpha`

B

`4sin^2 alpha`

C

4

D

`2sin^2 alpha`

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