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

NAME
     atanh - inverse hyperbolic tangent function

SYNOPSIS
     #include <&lt;math.h>&gt;

     double
     atanh(double x);

DESCRIPTION
     The atanh() function computes the inverse hyperbolic tangent of the real
     argument x. For a discussion of error due to roundoff, see math(3).

RETURN VALUES
     The atanh() function returns the inverse hyperbolic tangent of x if suc-
     cessful.  On the VAX and Tahoe, if the argument has absolute value bigger
     than or equal to 1, atanh() sets the global variable errno to EDOM and a
     reserved operand fault is generated.

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

HISTORY
     The atanh() function appeared in 4.3BSD.

4.3 Berkeley Distribution        June 4, 1993                                1