x=x(k,phi) is defined implicetly:
h3 is defined through
NSolve, so I cannot really express
phi. I need to Plot this function in 3D:
But, I need to plot in cylindrical coordinates, so that
phi is polar angle,
k is radius.
Here explicit function was used. I need to plot implicit.
ParametricPlot3D was used. But again, function was explicit.