GRAPH 3D v2.425 (20-FEB-2017)

[Didiron]

Hey people.

I installed this app and it h been working fine. But I ahve some problems when I put a function like this (that I saw in a youtube video):

1 - (cos(x^2 + y^2))/(x^2+y^2).

Accordng to the vdeo the graph should appear this way:



But it has been showed this:



Apparently, a part of the graph is not being showed. Someone know whats's wrong with it?

Thank you.