Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
plot (sin( 1 t) + 0.5 sin( 2 t) + 0.25 sin( 3 t))*sin(20 t)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random