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)((25+29-100)/(2*sqrt(25)*sqrt(29))
cos^(-1)((25+29-100)/(2*sqrt(25)*sqrt(29))
Natural Language
Math Input
Extended Keyboard