atanhf man page on BSDi

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

NAME
     atanh, atanhf - inverse hyperbolic tangent functions

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 reporting, see
     math(3).

ERRORS
     If |x| > 1 then:

     _IEEE_    The return value is NaN.
     _POSIX_   Same as _IEEE_, and errno is also set to EDOM.
     _XOPEN_   Same as _POSIX_, but errno is only set if matherr(3) returns 0.
	       The exception type is DOMAIN.
     _SVID_    Same as _XOPEN_, and a message is printed to stderr if errno is
	       set.

     If |x| = 1 then:

     _IEEE_    The return value is +-Inf, matching the sign of x.
     _POSIX_   Same as _IEEE_, and errno is also set to EDOM.
     _XOPEN_   Same as _POSIX_, but errno is only set if matherr(3) returns 0.
	       The exception type is SING.
     _SVID_    Same as _XOPEN_, and a message is printed to stderr if errno is
	       set.

SEE ALSO
     acosh(3),	asinh(3),  exp(3),  math(3)

HISTORY
     The atanh() function appeared in 4.3BSD.

4.3 Berkeley Distribution      February 17, 1998			     1
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