3. (21) Use Green's theorem to evaluate the line integral / (y + e) dx + (2.1' + cos 3/2) dy, an where D is the region enclosed by the parabolas y = :02 and :1: = y2. 1 2 (b) Use Green's theorem to calculate the total work needed to move an object along a path of straight lines from (1,0) to (0, a) and from (0, a) to (1,0) under the force eld: ts, y) = (43/3 3xy2+ (32: + 123/256 3:93;)