3
-----------
/ 2\
pi*\1 + x /
$$\frac{3}{\pi \left(x^{2} + 1\right)}$$
-6*x
------------
2
/ 2\
pi*\1 + x / $$- \frac{6 x}{\pi \left(x^{2} + 1\right)^{2}}$$
/ 2 \
| 4*x |
6*|-1 + ------|
| 2|
\ 1 + x /
---------------
2
/ 2\
pi*\1 + x / $$\frac{\frac{24 x^{2}}{x^{2} + 1} - 6}{\pi \left(x^{2} + 1\right)^{2}}$$