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.
1-((2/pi) arctan (tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.1)))) )
1-((2/pi) arctan (tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.9))+tan((pi/2) * (1-0.1)))) )
Natural Language
Math Input
Extended Keyboard