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.
det [ { Cos [ 108 ]°, -Sin [ 108 ] }, { Sin [ 108 ]° , Cos [ 108 ]° } ]
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random