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In any triangle A B C , prove that follo...

In any triangle `A B C` , prove that following : `(a-b)/(a+b)=(tan((A-B)/2))/(tan((A+B)/2))\ `

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Given,

`A + B + C = 180°`

`(A/2) + (B/2) + (C/2) = 90°`

`(A/2) + (B/2) = 90° – (C/2)`

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