# $EPIC: atanh.txt,v 1.3 2006/08/21 01:55:33 sthalik Exp $
======Synopsis:======
$[[atanh]](//<number>//)

======Technical:======
  * Returns the inverse hyperbolic tangent of //<number>//.
  * If the <number> argument is omitted the empty string is returned.
  * As always, the return value is limited to 6 decimal places.
  * As always, DOM or RANGE means there was an error.

======Returns:======
The inverse hyperbolic tangent of an angle

======History:======