Question: Prove that a 2 + b 2 + c 2 - a b - b c - c a is always non - negative for

Prove that a2+b2+c2-ab-bc-ca is always non-negative for all values of a,b and c q, ANSWER
Prove that a2+b2+c2-ab-bc-ca is always non-negative for all values of a,b

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