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Show that cot ""(A)/(2) + cot "" ...

Show that
` cot ""(A)/(2) + cot "" ( B)/(2) + cot "" ( C ) /(2) = (S^(2))/( Delta ) `

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r ( cot "" ( B) /(2) + cot "" ( C) /(2)) =

r^(2) cot ""(A)/(2) cot ""(B)/(2) cot ""(C)/(2)

In Delta ABC, cot ""(A)/(2) +cot""(B)/(2) + cot""(C)/(2)=

In Delta ABC r_1 cot "" (A)/(2) + r_2 cot "" (B)/(2) + r_3 cot "" ( C )/(2) =

( cot ""(A)/(2) + cot ""(B)/(2)+ cot ""( C )/( 2))/( cot A + cot B + cot C ) =

In Delta ABC , r ( r_1 cot "" ( A) /(2) + r_2 cot "" ( B) /( 2) + r_3 cot "" ( C) /(2) ) =