graph 0.4*((1-.01*x^2)/(1+.01*x^2))+.6, x from 0 to 30 y from 0 to 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.