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જો cos^-1(x/a)+cos^-1(y/b)=alpha તો x^2...

જો `cos^-1(x/a)+cos^-1(y/b)=alpha ` તો `x^2/a^2-(2xy)/(ab)cosalpha +y^2/b^2`=______

A

`cos^2 alpha `

B

`tan^2 alpha `

C

`sin^2 alpha `

D

`cot^2 alpha `

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