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Prove that: |[(b+c)^2,a^2,a^2],[b^2,(c+a...

Prove that: `|[(b+c)^2,a^2,a^2],[b^2,(c+a)^2,b^2],[c^2,c^2,(a+b)^2]|=2a b c(a+b+c)^3`

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