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=pi/8, B=pi/4, C=pi-A-B, t=2 pi (42) tan^2(A/2) tan^2(C/2)/( tan A(tan(A/2) + tan(C/2))^2)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random