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જોcot^-1(sqrtcos alpha )-tan^-1(sqrt cos...

જો`cot^-1(sqrtcos alpha )-tan^-1(sqrt cos alpha )= x ` તો `sin x =`_______

A

`tan^2(alpha/2)`

B

`cot^2(alpha /2)`

C

`tan alpha `

D

`cot(alpha /2)`

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