acosh3
Inverse hyperbolic cosine functions
Usage
#include <math.h>
double
acosh(double x);
float
acoshf(float x);
long double
acoshl(long double x);
Library
Math Library (libm, -lm)
Overview
The acosh(), acoshf(), and acoshl() functions compute the inverse hyperbolic cosine of the real argument x. For a discussion of error due to roundoff, see math(3).
Return values
These functions return the inverse hyperbolic cosine of x. If the argument is less than 1, acosh() raises an invalid exception and returns an .
Releases
87 releases since FreeBSD 2.0.5-RELEASE; the text changed 46 times.