## onegirl Group Title Find the sum of sin2x and sinx 2 years ago 2 years ago

1. CliffSedge

I don't understand the question. Don't you just add them together since that's what "sum" means?

2. onegirl

its trig identities

3. CliffSedge

Do you want it only in terms of sin(x)? Here's a list of identities. http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf

4. across

The best you can do is simplify the expression:$\sin2x+\sin x\\ 2\sin x\cos x+\sin x\\ \sin x(2\cos x+1)$

5. onegirl

yea in terms of sinx