Sin A + sin B+ sin C = 4Cos (A/2) Cos (B/2)+ Cos (C/2)

sin A + sin B+ sin C=4*Cos (A/2)* Cos (B/2)+ Cos (C/2)

Sin A + sin B+ sin C = 4*Cos (A/2)* Cos (B/2)+ Cos (C/2)