Hi everyone!
I'm trying to use the 3D plot function, but since my function is non-trivial, I'm not having success, because I'm not sure about the domain (x,y) that makes f(x,y) real.
f[x_, y_] = ((2 e^-x y)/pi) tanh^-1 (x^2/(x^4 - y^4)^(1/2))
Plot3D[f[x, y], {x, a, b}, {y, c, d}]
