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Power Serieseasy
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A physical system is modeled by the function f(x)=∑n=0∞xnn!f(x) = \sum_{n=0}^{\infty} \frac{x^n}{n!}f(x)=∑n=0∞​n!xn​. What is the value of the function f(x)f(x)f(x) at x=0x=0x=0?