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.
\cos{4x}\cos{8x}=\sin{x}\left(2\cos{8x}+1 \right )
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
