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Math Library (libm, -lm)

#include <math.h>

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).

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.

The
`atanh()`,
`atanhf()`,
and
`atanhl()`
functions appeared in
*BSD 4.3,*
FreeBSD 2.0,
and
FreeBSD 10.0,
respectively.

ATANH (3) | June 9, 2013 |

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