Question
The function $\mathrm{f}(\mathrm{x})=\frac{|\mathrm{x}|}{1+\mathrm{x}^{2}}$ is differentiable on(a) $[0, \infty)$(b) $(-\infty, 0]$(c) $(-\infty, \infty)$(d) $(-\infty, \infty)-\{0\}$.
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