/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
#include <math.h>

double sinh(double x)
{
    if (x >= 0.0) {
        const double epos = exp(x);
        return (epos - 1.0 / epos) / 2.0;
    } else {
        const double eneg = exp(-x);
        return (1.0 / eneg - eneg) / 2.0;
    }
}