1ATANH(3)                   Linux Programmer's Manual                  ATANH(3)
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NAME

6       atanh, atanhf, atanhl - inverse hyperbolic tangent function
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SYNOPSIS

9       #include <math.h>
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11       double atanh(double x);
12       float atanhf(float x);
13       long double atanhl(long double x);
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15       Link with -lm.
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DESCRIPTION

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

24       EDOM   x is out of range.
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CONFORMING TO

27       SVr4, POSIX.1-2001, 4.3BSD, C89.  The float and  long  double  variants
28       are C99 requirements.
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SEE ALSO

31       acosh(3), asinh(3), catanh(3), cosh(3), sinh(3), tanh(3)
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35                                  2002-07-27                          ATANH(3)
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