ACOSH(3) BSD Programmer's Manual ACOSH(3)NAME
acosh, acoshf - inverse hyperbolic cosine function
LIBRARY
libm
SYNOPSIS
#include <math.h>
double
acosh(double x);
float
acoshf(float x);
DESCRIPTION
The acosh() and acoshf() functions compute the inverse hyperbolic cosine
of the real argument x.
RETURN VALUES
If x is less than one, acosh(x) and acoshf(x) return NaN and set the glo-
bal variable errno to EDOM.
SEE ALSOasinh(3), atanh(3), exp(3), math(3)HISTORY
The acosh() function appeared in 4.3BSD.
MirOS BSD #10-current May 6, 1991 1