We discuss ways to compute derivatives on a spreadsheet, with emphasis on repeating the symmetric approximation with exponentially decreasing d and extrapolating the results.
7.1 Introduction: the Obvious Approximation: f'(x) ~ (f(x+d) - f(x))/d
7.2 Round off Errors and the Derivative
7.3 The Symmetric Approximation: f'(x) ~ (f(x+d) - f(x-d)/(2d)
7.4 Extrapolating the Sequence of Answers