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SeriesCoefficient

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SeriesCoefficient[series, n]
finds the coefficient of the n^(th) order term in a power series in the form generated by Series.
SeriesCoefficient[f, {x, x0, n}]
finds the coefficient of (x-x_0)^n in the expansion of f about the point x=x_0.
SeriesCoefficient[f, {x, x0, nx}, {y, y0, ny}, ...]
finds a coefficient in a multivariate series.
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