a²+2ab+b²= (a+b)²
91²+2*91*38+38²= (91+38)²= 129²= 16641
(91+38)^2=129^2=16641
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a²+2ab+b²= (a+b)²
91²+2*91*38+38²= (91+38)²= 129²= 16641
(91+38)^2=129^2=16641