Hello,

I have a function f=(x^2+y^2)/z , F=grad(f)=2x/z i + 2y/z j + (x^2+y^2)/z^2 k.

I am supposed to find the field lines of F but I can't really understand how to do this from reading the book.

I did it in 2D and kind of got it but in 3D I am lost.

Any help here is really appreciated.