Evaluate sin(1/2)θ+sinθ

Question

I dont know how to evaluate this problem, please help me, thank you.

Answer 1

It is unclear exactly what form you need but let's look at half angle formulas

sin(t) = 2cos(t/2)sin(t/2)

Then,

sin(t/2) + 2cos(t/2)sin(t/2) = sin(t/2){1 + 2cos(t/2)}