Using the fact that ((1 / n !)) is the coefficient of (x^{n}) in the power expansion
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Using the fact that \((1 / n !)\) is the coefficient of \(x^{n}\) in the power expansion of the function \(\exp (x)\), derive an asymptotic formula for this coefficient by the method of saddle-point integration. Compare your result with the Stirling formula for \(n\) !.
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