Express the integral of the following functions over the given regions (double integral) in terms of a repeated integral (Do not compute the repeated inte- grals). Jus (a) re" over the region defined by || +y1. (b) x+y over the triangle whose vertices are (-3,0), (3, 6), and (3,-3). - 1 (c) x2 over the region defined by 202 + y 2, and 2+ y 1. (d) 2y over the region between y = x and y = x(1-x).