atanh man page on 4.4BSD

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ATANH(3)		 BSD Library Functions Manual		      ATANH(3)

NAME
     atanh — inverse hyperbolic tangent function

SYNOPSIS
     #include <math.h>

     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	     4.3 Berkeley Distribution
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