plot of y=0.5*sin(x) and y=sin(x+(2/3)*3.14) and y=0.5*sin(x)+sin(x+(2/3)*3.14) for x=-5 to 5

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.