# asinh(3) [opendarwin man page]

```ASINH(3)						   BSD Library Functions Manual 						  ASINH(3)

NAME
asinh -- inverse hyperbolic sine function

SYNOPSIS
#include <math.h>

double
asinh(double x);

DESCRIPTION
The asinh() function computes the inverse hyperbolic sine of the real argument

SPECIAL VALUES
asinh(+-0) returns +-0.

asinh(+-infinity) returns +-infinity.

acosh(3), atanh(3), exp(3), infnan(3), math(3), matherr(3)

STANDARDS
The asinh() function conforms to ISO/IEC 9899:1999(E).

4.3 Berkeley Distribution					 November 18, 2002					 4.3 Berkeley Distribution```

## Check Out this Related Man Page

```ASINH(3)						     Linux Programmer's Manual							  ASINH(3)

NAME
asinh, asinhf, asinhl - inverse hyperbolic sine function

SYNOPSIS
#include <math.h>

double asinh(double x);
float asinhf(float x);
long double asinhl(long double x);

Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

asinh(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 500 || _ISOC99_SOURCE; or cc -std=c99
asinhf(), asinhl(): _BSD_SOURCE || _SVID_SOURCE || _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; or cc -std=c99

DESCRIPTION
The asinh() function calculates the inverse hyperbolic sine of x; that is the value whose hyperbolic sine is x.

RETURN VALUE
On success, these functions return the inverse hyperbolic sine of x.

If x is a NaN, a NaN is returned.

If x is +0 (-0), +0 (-0) is returned.

If x is positive infinity (negative infinity), positive infinity (negative infinity) is returned.

ERRORS
No errors occur.

CONFORMING TO
C99, POSIX.1-2001.  The variant returning double also conforms to SVr4, 4.3BSD, C89.