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ACOSH(3) FreeBSD Library Functions Manual ACOSH(3)
NAME
acosh, acoshf, acoshl - inverse hyperbolic cosine functions
LIBRARY
Math Library (libm, -lm)
SYNOPSIS
#include <math.h>
double
acosh(double x);
float
acoshf(float x);
long double
acoshl(long double x);
DESCRIPTION
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 NaN.
SEE ALSO
asinh(3), atanh(3), exp(3), fenv(3), math(3)
HISTORY
The acosh(), acoshf(), and acoshl() functions appeared in 4.3BSD,
FreeBSD 2.0, and FreeBSD 10.0, respectively.
FreeBSD 14.0-RELEASE-p11 June 9, 2013 FreeBSD 14.0-RELEASE-p11