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

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

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Using properties of determinants prove the following. abs[[b+c,a,a],[b,c+a,b],[c,c,a+b]]=4abc

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