1. Derive the following two 4-th order formulas fro second derivatives (analytically). (a) eta = (1 7282)82 + O(h4) (b) = (1 + R282)-152 + O(14) 1. Derive the following two 4-th order formulas fro second derivatives (analytically). (a) eta = (1 7282)82 + O(h4) (b) = (1 + R282)-152 + O(14)