Check my work:
At what value of x does the function 1/(1+x^2) change from increasing to decreasing?
I'm not sure what I did, but I think it's right.
My work: Derivative 1/(1+x^2) -> -2x/(1+x^2)^2 = 0. Solving for x gives 0. Therefore, the answer is zero.

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I'm not sure what I did. Did I find the inflection point?

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