- (a) about a = ro, for both f(ro-h), and f(xo-2h) to derive the following formula. Use the order n = 2 Taylor approximations, with error term, expanded %3D f(zo)- 2f(ro -h) + f(xo - 2h) "(zo) = (b) In big-Oh notation what is the order of the error for this method in terms of step size h? Use the above formula on the data below with h = 0.15 to compute an (c) approximation to f"(1.65). %3D f(x) 1.35 0.2466 1.45 0.2869 1.50 0.3033 1.55 0.3173 1.65 0.3393