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

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

If A, B, C are interior angle of triangle ABC then show that sin ((A+B)/2) + cos (( A+ B)/2) = cos (C/2) + sin (C/2)

If A, B, C are the angles of a triangle such that "cot"(A)/(2)="3 tan"(C )/(2) , then sin A, sin B, sin C are in

In DeltaABC show that (a+b+c)(tan.(A)/(2)+tan.(B)/(2))=2cot.(C)/(2)

If ABC are angle of a triangle then prove that cot Acot B+ cot Bcot C+cotCcostA=1

If Delta =a^2-(b-c)^2 , is the area of the triangle ABC, then tan A=

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