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" A) "|[a,c,a+c],[a+b,b,a],[b,b+c,c]|=4a...

" A) "|[a,c,a+c],[a+b,b,a],[b,b+c,c]|=4abc

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|[b+c, a,a] , [b,c+a,b] , [c,c,a+b]|=4abc

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Prove that |[b+c,a,a],[b,c+a,b],[c,c,a+b]| = 4abc

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