factorise ( l + m ) ^2 - 41 m
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(l+m) ^2 - 4 l m
=> l^2 +m^2 +2lm - 4lm
=> l^2 +m^2 - 4lm
=> (l-m) ^2
=> l^2 +m^2 +2lm - 4lm
=> l^2 +m^2 - 4lm
=> (l-m) ^2
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