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Show that |(a-b-c,2a,2a),(2b,b-c-a,2b),(...

Show that `|(a-b-c,2a,2a),(2b,b-c-a,2b),(2c,2c,c-a-b)|= (a+b+c)^(3)`

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|(a-b-c,2b,2c),(2a,b-c-a,2c),(2a,2b,c-a-b)|=

Show that |(a+b+2c,a,b),(c,b+c+2a,b),(c,a,c+a+2b)|=2(a+b+c)^(3) .

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