`(sin(A - B))/(sin A sin B) + (sin(B - C))/(sin B sin C) + (sin (C - A))/(sin C sin A)=0`

Prove that: (sin(A-B))/(s in As in B)+(sin(B-C))/(s in Bs in C)+(sin(C-A))/(s in Cs in A)=0

b sin Bc sin C = a sin (BC)

In any Delta ABC, prove that :(a^(2)sin(B-C))/(sin B+sin C)+(b^(2)sin(C-A))/(sin C+sin A)+(c^(2)sin(A-B))/(sin A+sin B)=0

In any triangle ABC, prove that: (a^(2)sin(B-C))/(sin B+sin C)+(b^(2)sin(C-A))/(sin C+sin A)+(c^(2)sin(A-B))/(sin A+sin B)=0

Prove that (a^(2)sin(B-C))/(sin b+sin C)+(b^(2)sin(C-A))/(sin C+sin A)+(c^(2)sin(A-B))/(sin A+sin B)=0

Simplify: sin (B + C) sin (B - C) + sin (C + A) sin (C - A) + sin(A + B) sin (A - B)

a sin A-b sin B=c sin(A-B)