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    CoTec()

         Calculates a number co-tangent

    Syntax:

         CoTan( nNumber ) -> nCoTan

         nNumber : The number to calculate the co-tangent from

    Description:

         Calculates a number co-tangent with a numeric method.
         Warning!!
         The number has to be in radians, not in degrees.

    Return:

         The specified number co-tangent or Nil if the number is not
         specified.

    Example:

         CoTan( Deg2Rad ( 45 ) )         // 1.00