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 f(t)=2sin(989.5 t)*cos(219.5 t)
plot f(t)=2sin(989.5 t)*cos(219.5 t)
Natural Language
Math Input
Extended Keyboard