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atanh(3) [redhat man page]

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

NAME
atanh - inverse hyperbolic tangent function

SYNOPSIS
#include <math.h>

double atanh(double x);

DESCRIPTION
The  atanh()  function  calculates  the	inverse hyperbolic tangent of x; that is the value whose hyperbolic tangent is x.  If the absolute
value of x is greater than 1.0, acosh() returns not-a-number (NaN) and errno is set.

ERRORS
EDOM   x is out of range.

CONFORMING TO
SVID 3, POSIX, BSD 4.3, ISO 9899

asinh(3), acosh(3), cosh(3), sinh(3), tanh(3)

1993-06-13								  ATANH(3)```

Check Out this Related Man Page

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

NAME
atanh, atanhf, atanhl -- inverse hyperbolic tangent functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
atanh(double x);

float
atanhf(float x);

long double
atanhl(long double x);

DESCRIPTION
The atanh(), atanhf(), and atanhl() functions compute the inverse hyperbolic tangent of the real argument x.  For a discussion of error due
to roundoff, see math(3).

RETURN VALUES
These functions return the inverse hyperbolic tangent of x if successful.	If the argument has absolute value 1, a divide-by-zero exception
is raised and an infinity is returned.  If |x| > 1, an invalid exception is raised and an NaN is returned.