3) Consider a Cylinder with the x-axis as the axis of symmetry and a radius of base equal to 3. a) Find a parametric representation of the portion of the cylinder which is in the octant x >= 0,y >= 0,2 >= 0 and is
confined between the planes x = 1 and x = 4.
b) Using the parametric representation of part a) above, calculate the surface area of the portion of the cylinder. ​