-2
-----------------
/ 2\ 3
\1 + x /*atan (x)
$$- \frac{2}{\left(x^{2} + 1\right) \operatorname{atan}^{3}{\left(x \right)}}$$
/ 3 \
2*|2*x + -------|
\ atan(x)/
------------------
2
/ 2\ 3
\1 + x / *atan (x)
$$\frac{2 \cdot \left(2 x + \frac{3}{\operatorname{atan}{\left(x \right)}}\right)}{\left(x^{2} + 1\right)^{2} \operatorname{atan}^{3}{\left(x \right)}}$$
/ 2 \
| 6 4*x 9*x |
4*|1 - ----------------- - ------ - ----------------|
| / 2\ 2 2 / 2\ |
\ \1 + x /*atan (x) 1 + x \1 + x /*atan(x)/
-----------------------------------------------------
2
/ 2\ 3
\1 + x / *atan (x)
$$\frac{4 \left(- \frac{4 x^{2}}{x^{2} + 1} + 1 - \frac{9 x}{\left(x^{2} + 1\right) \operatorname{atan}{\left(x \right)}} - \frac{6}{\left(x^{2} + 1\right) \operatorname{atan}^{2}{\left(x \right)}}\right)}{\left(x^{2} + 1\right)^{2} \operatorname{atan}^{3}{\left(x \right)}}$$