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acoshl (3)
ACOSH(3) Linux Programmer's Manual ACOSH(3)
NAME
acosh, acoshf, acoshl - inverse hyperbolic cosine function
SYNOPSIS
#include <math.h>
double acosh(double x);
float acoshf(float x);
long double acoshl(long double x);
Link with -lm.
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
acosh(), acoshf(), acoshl(): _BSD_SOURCE || _SVID_SOURCE ||
_XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
DESCRIPTION
The acosh() function calculates the inverse hyperbolic cosine of x;
that is the value whose hyperbolic cosine is x. If x is less than 1.0,
acosh() returns not-a-number (NaN) and errno is set.
ERRORS
EDOM x is out of range.
CONFORMING TO
SVr4, POSIX.1-2001, 4.3BSD, C89. The float and long double variants
are C99 requirements.
SEE ALSO
asinh(3), atanh(3), cacosh(3), cosh(3), sinh(3), tanh(3)
2007-07-26 ACOSH(3)
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