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Math 133 Taylor Series

math 133 Taylor SeriesStewart representation of a main purpose of Series is to write agiven complicated quantity as an infinite sum of simple terms; and since the termsget smaller and smaller, we can approximate the original quantity by taking only thefirst few terms of the Series . In this section, we finally develop the tool that lets us dothis in most cases: a way to write any reasonable function as an explicit power will allow us to compute outputs of the function by plugging into the functions must behave decently near the center point of the desired powerseries. We sayf(x) isanalyticatx=aif it is possible to writef(x) = n=0cn(x a)nfor some coefficientscn, with positive radius of convergence. In practice, any formulainvolving standard functions and operations defines an analytic function, providedthe formula gives real number values in a small interval aroundx=a.

A Taylor series centered at a= 0 is specially named a Maclaurin series. Example: sine function. To nd Taylor series for a function f(x), we must de-termine f(n)(a). This is easiest for a function which satis es a simple di erential equation relating the derivatives to the original function. For example, f(x) = sin(x)

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