Factor
\frac{4x^{2}+8xy-4xz+4y^{2}-4yz+z}{4}
Evaluate
-xz-yz+\left(x+y\right)^{2}+\frac{z}{4}
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\frac{4x^{2}+4y^{2}+z+8xy-4yz-4zx}{4}
Factor out \frac{1}{4}.
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