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Question
Factorise it by identity (l + m) sq. — 4lm
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Solution
l^2+2lm+m^2-4lm
=l^2-2lm+m^2
=(l-m)^2
l^2+2lm+m^2-4lm
=l^2-2lm+m^2
=(l-m)^2
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