expm1

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.

Special Values
xe$(SUP x)-1
±0.0±0.0
+∞+∞
-∞-1.0
NaNNaN
real
expm1
(
real x
)

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