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Power Serieseasy
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Using the Maclaurin series for ex=∑n=0∞xnn!e^x = \sum_{n=0}^{\infty} \frac{x^n}{n!}ex=∑n=0∞​n!xn​, what is the first non-zero term of the Maclaurin series for f(x)=ex−1−xf(x) = e^x - 1 - xf(x)=ex−1−x?