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.
a^2+b^2-2cos(60)ab= 50^2,a^2+b^2-2cos(58.7)ab=49^2
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random