please help with part b. if you could add part a also so i can check my answer that would be nice

x (0, 9) = (R + r sin ($)) cos (0) 4. The boundary of a solid E is described by surface OE : } y (0, $) = (R + rsin ($)) sin (0) z (0, 0) = r cos (Q) for all 0, o E [0, 27] and some constants r, R satisfying 0