Show that in any triangle `ABC, (a+b+c) (tan (A/2) + tan (B/2)) = 2c cot (C/2)`

In any triangle ABC, show that, (a+b-c) (cot A/2 + cotB/2) = 2c cot C/2

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

In any triangle ABC, prove that : tan frac (B+C-A)(2)= cot A .

If A, B and C are interior angles of a triangle ABC, then show that tan((A + B)/(2)) = cot ""(C)/(2)

In any triangle ABC , prove that tan ((A-B)/(2))=((a-b)/(a+b))cot (C)/(2) .

In any triangle ABC, the value of (b+c) tan ""A/2 tan ""(B-C)/(2)+ (c+a) tan ""B/2 tan ""(C-A)/(2) + (a+b) tan ""C/2 tan ""(A-B)/(2) is-

In any Delta ABC , prove that : ((a-b)/c) = (tan (A/2) - tan (B/2))/(tan (A/2) + tan (B/2)

In any triangle ABC, prove that tan((B-C)/2)=(b-c)/(b+c) cot frac (A)(2)

If A , B and C are interior angles of a triangle ABC, then show that tan ((A+B) /(2)) =cot (C/2)