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prove that, |{:(" "2a,a-b-c," "2a),(...

prove that, `|{:(" "2a,a-b-c," "2a),(" "2b," "2b,b-c-a),(c-a-b," "2c," "2c):}|=(a+b+c)^3`

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The correct Answer is:
`= (a+b+c)^2(a+b+c) =(a+b+c)^3`
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