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.
arctan(tan(20) - sqrt(1 + tan^2(20)))+arctan(tan(20) + sqrt(1 + tan^2(20)))=
arctan(tan(20) - sqrt(1 + tan^2(20)))+arctan(tan(20) + sqrt(1 + tan^2(20)))=
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
