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[" 4.If "a,b" and "c" are real numbers,a...

[" 4.If "a,b" and "c" are real numbers,and "],[qquad [Delta=|[b+c,c+a,a+b],[c+a,a+b,b+c],[a+b,b+c,c+a]]=0],[" Show that either "a+b+c=0" or "a=b=c]

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