Derivative of $y = \frac{x^2+1}{x-1}$ is?

University of Ilorin MTH102 2025A past question

1. $\frac{x^2 - 2x - 1}{(x-1)^2}$
2. $\frac{x^2 + 2x - 1}{(x-1)^2}$
3. $\frac{x^2 - 2x + 1}{(x-1)^2}$
4. $\frac{2x}{(x-1)^2}$

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