PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8
expm1 - Returns exp(number) - 1, computed in a way that is accurate even when the value of number is close to zero
expm1( float$num ): float
expm1 returns the equivalent to 'exp(num) - 1' computed in a way that is accurate even if the value of num is near zero, a case where 'exp (num) - 1' would be inaccurate due to subtraction of two numbers that are nearly equal.
The argument to process
'e' to the power of num minus one
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