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