Check whether the following are quadrati...

Check whether the following are quadratic equations:
(i) `(2x-1)(x-3)=(x+4)(x-2)" "(ii)" "(x+2)^(3)=2x(x^(2)-1)`
(iii) `(x+1)^(3)=x^(3)+x+6" "(iv)" "x(x+3)+6=(x+2)(x-2)`

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