a) df(x, h) = 3x2h, e(x, h) = 3xh + h2;   b) df(x, h) = (6x - 5)h, e(x, h) = 3h;   c) df(x, h) = 10h---
5+ x2, e(x, h) = --------10h---------
(5 + x)2(5 + x + h);   d) df(x, h) = -2h-
x3, e(x, h) =          2
3xh-+--2h--
x3(x + h)2.