Prove that if x, y and z are three real numbers such that x 2 + y2 + z2 < x y + x z +
Chapter 3, Problem 3.7(choose chapter or problem)
Prove that if x, y and z are three real numbers such that x 2 + y2 + z2 < x y + x z + yz, then x + y + z > 0.
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