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.
1/3(int(r^2)drdt r from 0 to 4 t from 0 to 2pi
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
