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%20cos%20(2t%2B.7)%20%2B%20cos%203t%20%2B%20cos%20(5t%2B1.3)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
