6. Set up the iterated integral, using cylindrical coordinates, for evaluating f(r,0,z) dz r dr de over the region D, described as follows. z=3-y D is the solid cylinder whose base is the region in the xy-plane between the circles r = cos and r = 2 cos 0 and whose top lies in the plane z = 3-y. y x r = cos 0 r = 2 cos 0