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In a Delta ABC show that (a+b+c)(tan(A/2...

In a `Delta` ABC show that `(a+b+c)(tan(A/2)+tan(B/2))=2 c cot(C/2)`

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In Delta ABC ,(a+b+c) (tan ""(A)/(2) +tan ""(B)/(2) ) tan "" ( C) /(2) =