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

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

Let A,B,C be angles of triangles with vertex A -= (4,-1) and internal angular bisectors of angles B and C be x - 1 = 0 and x - y - 1 = 0 respectively. If A,B,C are angles of triangle at vertices A,B,C respectively then cot ((B)/(2))cot .((C)/(2)) =

In a triangle ABC if b+c=3a then find the value of cot(B/2)cot(C/2)

In acute angled triangle ABC prove that tan ^(2)A+tan^(2)B+tan^(2)Cge9 .

In a triangle ABC , a =2,b=3 and sin A = (2)/(3) then cos C=

In a Delta ABC, prove that a sin ((A)/(2) + B) = (b + c) sin ""(A)/(2)

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

In a triangle ABc , if r^2cot(A/2) cot(B/2) cot(C/2)=

Find the angle A in triangle ABC, if angle B=60^∘ and angle c=70^∘

If in a triangle ABC , a=15 , b= 36 , c = 39 then sin"" (C )/(2) =