Question 78344
<pre>
{{{(2/(k-1))/(2/(k+1))}}}


     2            2
   ______   ÷   _______
   k - 1         k + 1



    2           k + 1
 ________ *   _________
  k - 1           2


   {{{cross (2)}}}           k + 1
 ________ *   _________
  k - 1          {{{cross (2)}}}



     k + 1
   _________
     k - 1