a) dy 72 dx +xy +1 =0 b) dy _2vte2x = 0, y(0) = 2 dx c) (2xy + y2 ) dx + (x2 + 2xy) dy = 0 d) dy _ dx = xy2 - xy, y(0) = -1 day e) dx4 =X-1, y(0) = y'(0) = 1, y"(1) = y"(1) =0