>plot3d(1+sin(t),t=0..Pi,s=0..Pi,coords=spherical,scaling=constrained):
> r:=1+cos(t);
> x:=r*cos(t);
> rho:=r*sin(t);
> y:=rho*cos(s);
> z:=rho*sin(s);
>plot3d([x,y,z],t=0..Pi,s=0..Pi,scaling=constrained):
> r:=1+cos(2*t);
> rho:=r*cos(t);
> y:=r*sin(t);
> x:=rho*cos(s);
> z:=rho*sin(s);
> plot3d([x,y,z],t=0..Pi/2,s=0..Pi,scaling=constrained,grid=[25,25]):
> r:=3*cos(t)-cos(3*t);
> x:=r*cos(s);
> y:=r*sin(s);
> z:=3*sin(t)-sin(3*t);
>plot3d([x,y,z],t=-Pi/2..Pi/2,s=0..Pi,scaling=constrained):
