## Info

- 2 fxz(a, b)(x - a)(z - b) + fzz(a, b)(z - b)2] + • • •

where fx = partial derivative of the function with respect to (w.r.t) X, fxx = second partial derivative of the function w.r.t. X and similarly for the variable Z. If we want a linear approximation to the function, we will use the first two terms in (3), if we want a quadratic, or second-degree, approximation, we will use the first three terms in (3), and so on.

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