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[a,b+c,a^(2)],[b,c+a,b^(2)],[c,a+b,c^(2)...

[a,b+c,a^(2)],[b,c+a,b^(2)],[c,a+b,c^(2)]|=-(a+b+c)(a-b)(b-c)(c-a)

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Prove that det[[a,b+c,a^(2)b,c+a,b^(2)c,a+b,c^(2)]]=-(a+b+c)xx(a-b)(b-c)(c-a)

Prove that |(a,b+c,a^(2)),(b,c+a,b^(2)),(c,a+b,c^(2))|=-(a+b+c)xx(a-b)(b-c)(c-a).

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