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

NAME
       atanh, atanhf, atanhl - inverse hyperbolic tangent function

SYNOPSIS
       #include <math.h>

       double atanh(double x);
       float atanhf(float x);
       long double atanhl(long double x);

       Link with -lm.

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, atanh() returns not-a-number (NaN) and errno
       is set.

ERRORS
       EDOM   x is out of range.

CONFORMING TO
       SVr4, POSIX.1-2001, 4.3BSD, C89.	 The float and	long  double  variants
       are C99 requirements.

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

				  2002-07-27			      ATANH(3)
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