Question 84643
The result says sinC + sinD = 2sin(C+D)/2 Cos (C-D)/2

So sin(6t) + sin(2t)= 2sin(6t+2t)/2 Cos(6t-2t)/2

                    = 2sin(8t/2) Cos (4t/2)

                   = 2sin(4t) Cos(2t)


Good Luck!!!