Prove that a2 + b2 + c2 - ab - bc - ca in always non negative for all value of a ,b and c

Prove that a2 + b2 + c2 - ab - bc - ca in always non negative for all

1.	Prove that a2 + b2 + c2 - ab - bc - ca in always non negative for all value of a ,b and c
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