Python expml function

Python expm1(x) function returns the natural exponential value of x minus 1. It is equal to math.e**x - 1. It's a method of math module.

>>> import math
>>> math.expml(2)
6.38905609893065
>>> math.e**2 - 1
6.38905609893065
>>> math.expml(3)
19.085536923187668
>>> math.expml(4)
53.598150033144236






















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