Question 710057
 a © b = a^2 – b^2=(a+b)(a-b)
(2013 © 2012) © (2012 © 2011)=[(2013+2012)(2013-2012)]©[(2012+2011)(2012-2011)]
=[4025]©[4023]=(4025+4023)(4025-4023)=8048*2=16096