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$$f(x)=\sum_{n=0}^\infty \frac{f^{(n)}(a)}{n!}(x-a)^n = f(a)... ...-a)+\frac{f''(a)}{2!}(x-a)^2 +\frac{f'''(a)}{3!}(x-a)^3+\cdots$$ (1)

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