Simplify each of the following expressions: (W) (i) \( (x+y+z)^{2}+\left(x+\frac{y}{2}+\frac{z}{...
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0Simplify each of the following expressions:
(W)
(i) \( (x+y+z)^{2}+\left(x+\frac{y}{2}+\frac{z}{3}\right)^{2}-\left(\frac{x}{2}+\frac{y}{3}+\frac{z}{4}\right)^{2} \)
(ii) \( (x+y-2 z)^{2}-x^{2}-y^{2}-3 z^{2}+4 x y \)
(iii) \( \left(x^{2}-x+1\right)^{2}-\left(x^{2}+x+1\right)^{2} \)
(1)
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