(1+x^2-(x*tan(0))^2)/((1+x^2-(x*tan(0))^2)^2+4*x^2*(x*tan(0))^2)

Uh oh! Wolfram|Alpha doesn't run without JavaScript.

Please enable JavaScript. If you don't know how, you can find instructionshere.Once you've done that, refresh this page to start using Wolfram|Alpha.