Practice problem
If reals a,b,ca,b,ca,b,c satisfy a2+b2+c2=ab+bc+ac,a^2+b^2+c^2=ab+bc+ac,a2+b2+c2=ab+bc+ac, how many possible values are there for a−b?a-b?a−b?
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Type a concept, like “slope” or “photosynthesis”.
