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

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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The correct Answer is:

`2(a++c)^(3)`

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