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Dear Student(l^2+ m^2) + (m^2+ n^2) + (n^2+ l^2) + (2lm + 2mn + 2nl)= l^2+ l^2 + m^2+ m^2+ n^2+ n^2+ 2lm + 2mn + 2nl= 2l^2+ 2m^2+ 2n^2+ 2lm + 2mn + 2nlThanks
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