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2). (m^2-nm)^2+2m^3n^2
(a+b)^2=a^2+b^2-2ab
a=m^2,b=NM
m square whole square-2 in 2 m square into nm +NM whole square +2 m cube n Square
m^4-2m^3n+n square m square + 2 m cube n Square
2). (m^2-nm)^2+2m^3n^2
(a+b)^2=a^2+b^2-2ab
a=m^2,b=NM
m square whole square-2 in 2 m square into nm +NM whole square +2 m cube n Square
m^4-2m^3n+n square m square + 2 m cube n Square
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