atanhf man page on FreeBSD

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[printable version]

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

NAME
atanh, atanhf — inverse hyperbolic tangent functions

LIBRARY
Math Library (libm, -lm)

SYNOPSIS
#include <math.h>

double
atanh(double x);

float
atanhf(float x);

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

RETURN VALUES
The atanh() and the atanhf() functions return the inverse hyperbolic tan‐
gent 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.

acosh(3), asinh(3), exp(3), fenv(3), math(3)

HISTORY
The atanh() function appeared in 4.3BSD.

BSD			       January 14, 2005				   BSD
```
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