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Prove: |(b+c)^2a^2b c(c+a)^2b^2c a(a+b)^...

Prove: `|(b+c)^2a^2b c(c+a)^2b^2c a(a+b)^2c^2a b|=(a-b)(b-c)(c-a)(a+b+c)(a^2+b^2+c^2)` .

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