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Find the domain of the following real functions:
(i) `f(x)=(3x+5)/(x^(2)-9)` (ii) `f(x)=(2x-3)/(x^(2)+x-2)`
(iii) `f(x)=(x^(2)-2x+1)/(x^(2)-8x+12)` (iv) `f(x)=(x^(3)-8)/(x^(2)-1)`