z=sin(x)sin(y)
z=x^2+y^2

x=(2+v*sin(2pi*u))sin(2pi*v)+
2(1-v)sin(3pi)
y=v*cos(2pi*u)+2(1-v)sin(2pi)
z=(2+v*sin(2pi*u))cos(2pi*v)+
2(1-v)cos(3pi)

x=cos(u)sin(v), y=sin(u)sin(v)
z=cos(v)+log(tan(v/2))+0.2u

x=(2+sin(2pi*v)sin(2pi*u))
sin(3pi*v)
y=sin(2pi*v)cos(2pi*u)+4v-2
z=(2+sin(2pi*v)sin(2pi*u))
cos(3pi*v)

z=sin(7r)/(1+r)^2

a=u, r=3+sin(9u)cos(v), z=v

a=v, r=5+cos(u), z=v+sin(u)

a=u, r=10sin(u), z=u

r=5

r=2sin(4b+cos(4a))