# $EPIC: cosh.txt,v 1.3 2006/07/24 19:50:14 sthalik Exp $
======Synopsis:======
$[[cosh]](//<number>//)

======Technical:======
  * Returns the hyperbolic cosine 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 hyperbolic cosine of an angle

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