[a-b][a+b]+[b-c][b+c]+[c-a][c+a]
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Answer:
[a-b][a+b]+[b-c][b+c]+[c-a][c+a]
=[a²-b²]+[ b²-c²] + [c²-a²]
=[a²-b²+b²-c²+c²-a²]
=0
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