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

University of Ilorin MTH102 2025A past question

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

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