(l-m) (l square - 2lm + m3)
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Answer:
l
2
+m
2
,m
2
+n
2
,n
2
+l
2
,2lm+2mn+2nl
Adding we get,
l
2
+m
2
+m
2
+n
2
+n
2
+l
2
+2lm+2mn+2nl
=2l
2
+2m
2
+2n
2
+2lm+2mn+2nl
=2(l
2
+m
2
+n
2
+lm+mn+nl)
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