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Which of the following are quadratic ...

Which of the following are quadratic equations? `(x+1/x)^2=3(x+1/x)+4` (ii) `(2x+1)(3x+2)=6(x-1)(x-2)` (iii) `x+1/x=x^2,\ \ x!=0`

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Which of the following are quadratic equations? (i) (x+1/x)^2=3(x+1/x)+4 (ii) (2x+1)(3x+2)=6(x-1)(x-2) (iii) x+1/x=x^2,\ \ x!=0

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