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RedHat 9 (Linux i386) - man page for atanh (redhat section 3)

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

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

					    1993-06-13					 ATANH(3)


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