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

b sin Bc sin C = a sin (BC)

if A + B + C = pi then (cos A) / (sin B sin C) + (cos B) / (sin C sin A) + (cos C) / (sin A sin B) =

(sin (AC) + 2sin A + sin (A + C)) / (sin (BC) + 2sin B + sin (B + C)) is

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

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

(sin B) / (sin (B + C)) = (b) / (a)

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

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