plot3d 1/(x^2+(1+1/(x*y))^2+1)+1/(y^2+(x+1)^2+1)+1/((1/(x*y))^2+(y+1)^2+1) for x from 0 to 5

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.