factorize
l cube over M Cube + M cube over n cube plus n cube over l cube minus 3
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l³/m³+m³/n³+n³/l³-3
here we can see the identity of
(a+b+c)(a²+b²+c²-ab-bc-ca)= a³+b³+c³-3abc
we have
(l/m+m/n+n/l)(l²/m²+m²/n²+n²/l²-lm-mn-nl)
here we can see the identity of
(a+b+c)(a²+b²+c²-ab-bc-ca)= a³+b³+c³-3abc
we have
(l/m+m/n+n/l)(l²/m²+m²/n²+n²/l²-lm-mn-nl)
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