Sketch the region and evaluate the double integral. 3 (a) JJ :Ä«dA, where R is the region bounded by the lines 2+1 (b) rfrogeã¡dA, where, and the triangle with vertres at (0,0) tne x-axiS. (b) JJ rye"dA, where R is the triangle with vertices at (0,0) (1,1), and (1,0)