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