2 1 4. (a) Evaluate [ f 233/3 .172 (y + 1) dy d1". (Make sure you Show all your working). 0 1 (b) Describe precisely (i.e. in the form [(1, b] x [(3, d] for appropriate at, b, c, d E R) the region of integration used in the integral 2 5 f / x2y+y2 dydcc. 1 2 (Make sure you explain briey how you arrived at your answer.) [2+1=3 marks]