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Prove that: |[a+b, b+c, c+a],[b+c,c+a,a+...

Prove that: `|[a+b, b+c, c+a],[b+c,c+a,a+b],[c+a,a+b,b+c]|=2|[a,b,c],[b,c,a],[c,a,b]|`

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