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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

`4 sin alpha `

B

`2 sin^2 alpha `

C

`4sin^2 alpha -2x^2 y`

D

`4cos^2 alpha +2x^2y^2`

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