Math Scalar Library
Programming Reference Manual C/C++
Version 1.0 DD-00003-010

8.2 sexpm1 - Exponentiation ex -1

#include <msca.h>

double sexpm1 (double x);
float  sexpm1f(float x);

Given a value x this function raises e to x and subtracts one, that is ex-1  . This function is more precise than using the equivalent operations.