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If a^2+b^2+c^2-a b-b c-c a=0, then (a)...

If `a^2+b^2+c^2-a b-b c-c a=0,` then
(a)`a+b=c`
(b) `b+c=a`
(c)`c+a=b`
(d) `a=b=c`

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