3D Grapher
Coordinates: Spherical
Function: a(u,v,t) = u/2*sin(v)*sin(u)
b(u,v,t) = v/2*cos(v)/cos(v)
R(u,v,t) = u^2+v^4-sin(v)/sin(v)
Domain of variables: Min U: -5 Max U: 20 Steps: 90
Min V: -5 Max V: 20 Steps: 90