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.
sum (r = 0 to 10) (cos^3(rpi/3))
sum (r = 0 to 10) (cos^3(rpi/3))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random