Evaluate
\left\{\begin{matrix}\frac{q\arctan(\frac{1}{|x|})}{8\pi L\epsilon _{0}|x|},&x\neq 0\\\text{Divergent},&x=0\end{matrix}\right.
Differentiate w.r.t. x
\left\{\begin{matrix}-\frac{q\left(|x|x^{2}\arctan(\frac{1}{|x|})+|x|\arctan(\frac{1}{|x|})+x^{2}\right)}{8\pi L\epsilon _{0}\left(x^{2}+1\right)x^{3}},&x\neq 0\\\text{Indeterminate},&x=0\end{matrix}\right.
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