Find a parametric representation for each of the surfaces.
1.) The part of the sphere x^2 + y^2 + z^2 = 4 that lies above the cone z= square root of x^2 + y^2
2.) The part of the cylinder x^2 + z^2 = 1 that lies between the planes y= -1 and y= 3
This provides examples of finding parametric representations for surface.