If x = 97, y = 98, z = 99 find x^2 + y^2 + z^2 - xy - yz - zx

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If x = 97, y = 98, z = 99 find x^2 + y^2 + z^2 - xy - yz - zx
This is a question to show how to form perfect squares and make the question very simple.
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It is excellent!😀
A very important identity!

Chrisoikmath_