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

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

In a triangle ABC, (a^2-b^2-c^2) tan A+ (a^2-b^2+c^2) tan B is equal to

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

In triangle ABC, if 3(tan'A/2' + tan'C/2') = 2 cot 'B/2 then show that, its sides a,b,c are in A.P.

Show that in a Delta ABC (cot B+cot C)/(tan B+tan C)+(cot C+cot A)/(tan C+tan A)+(cot A+cot B)/(tan A+tan B)=1

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