factories 2(a²+b²+c²-ab-bc-ac)
class 9
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2(a²+b²+c²-ab-bc-ac)
=2a²+2b²+2c²-2ab-2bc-2ca
= (a²-2ab+b²)+(b²-2bc+c²)+(c²-2ca+a²)
= (a-b)²+(b-c)²+(c-a)²
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