(^2+1)2 + (^2 -1 )2= 2+ 2^2 +1 + 2+ 2^2 +1 = 4^2+6
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(^2+1)2 + (^2 -1 )2= 2+ 2^2 +1 + 2+ 2^2 +1 = 4^2+6