Simplify each of the following: (i) \( (x+3)^{3}+(x-3)^{3} \) (ii) \( \left(\frac{x}{2}+\frac{y}...

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Simplify each of the following:
(i) \( (x+3)^{3}+(x-3)^{3} \)
(ii) \( \left(\frac{x}{2}+\frac{y}{3}\right)^{3}-\left(\frac{x}{2}-\frac{y}{3}\right)^{3} \)
(iii) \( \left(x+\frac{2}{x}\right)^{3}+\left(x-\frac{2}{x}\right)^{3} \)
(iv) \( (2 x-5 y)^{3}-(2 x+5 y)^{3} \)
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