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(1·(π/8))·cos(2·(π/8))·cos(3·(π/8))·cos(4·(π/8))·cos(5·(π/8))·cos(6·(π/8))·cos(7·(π/8))·cos(8·(π/8))
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random