Prove that: x2 + y2 + z2 - xy - yz - zx is always positive.

1.	Prove that: x2 + y2 + z2 - xy - yz - zx is always positive.
Answer» Prove that: x² + y² + z² - xy - yz - zx is always positive.

Answer»

Prove that:

x² + y² + z² - xy - yz - zx is always positive.

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