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.
(2*sqrt(15*(5−sqrt(5)))/5)/(sqrt(15*(85−31*sqrt(5)))/11)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random