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

What is the value of sin(A+B)sin(A-B)+sin(B+C)sin(B-C)+sin(C+A)sin(C-A) ?

19.Prove that sin (A + B) sin (AB) + sin (B + C) sin (BC) + sin (C + A) sin (CA) = 0

Show that: sin A sin(B-C)+sin B sin(C-A)+sin C sin(A-B)=0

In a DeltaABC , prove that : sin3A sin(B-C)+sin3B sin(C-A) + sin3C sin (A-B)=0 .

Prove that: ("sin"(A-B))/(sin A sin B)+("sin"(B-C))/(sin B sin C)+("sin"(C-A))/(sin C sin A)=0

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

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

Show that 4 sin A sin Bsin C = sin(A+B-C) + sin (B+C-A) + sin(C+A-B)-sin(A+B+C).

sin (A+B+C)+sin(A-B-C)+sin(A+B-C)+sin(A-B+C)=

Solve the following: If A+B+C=pi ,prove that sin(B+2C)+sin(C+2A)+sin(A+2B)= 4sin((B-C)/2)sin((C-A)/2)sin((A-B)/2)