Question 78489
       1
a-   ----------
           2
     2-   ------     
            2- 2/a
----------------------
Work it from the bottom up:
       1
a-   ----------
           2
     2-   ------     
            (2a- 2)/a
---------------
       1
a-   ----------
           2a
     2-   ------     
            (2a- 2)
----------------
       1
a-   ----------
           a
     2-   ------     
            (a- 1)
-------------
       1
a-   ----------           
     [2(a-1)- a]
        ------     
        (a- 1)
-------------
     1
a-   ----------           
     [(a-1)]
      ------     
      (a- 1)
-----------
a=1
===========
Cheers,
Stan H.