Krishan W. answered • 02/17/15
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Krishan Lal, a Math Man
(l + m)2 - (l - m)2
(l + m + l - m) (l +m -l + m)
2l* 2m
=4 lm
Srinibha R.
asked • 02/17/15(l+m)square - (l-m)square
factorise
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