(x+y-z)^2 please formula
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=x^2+y^2+(-z)^2+2xy+2y(-z)+2(-z)(x)=
x^2 + y^2 +z^2 +2xy -2yz - 2zx how it help u
x^2 + y^2 +z^2 +2xy -2yz - 2zx how it help u
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