Calculates the value of the natural logarithm base (e) raised to the power of x, minus 1.
For very small x, expm1(x) is more accurate than exp(x)-1.
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See Implementation
Calculates the value of the natural logarithm base (e) raised to the power of x, minus 1.
For very small x, expm1(x) is more accurate than exp(x)-1.
)
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