1.

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

Answer»

` (DELTA )/( S^(2))`
` ( S^(3))/( Delta ) `
` (S)/(Delta)`
` ( S^(2))/(Delta)`

ANSWER :D


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