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 *( cos(x) - cos^3(x)) - 1/12(cos(3x) - 9cos(x))
-1/3 *( cos(x) - cos^3(x)) - 1/12(cos(3x) - 9cos(x))
Natural Language
Math Input
Extended Keyboard
