2
9*atan (x)
----------
2
1 + x
$$\frac{9 \operatorname{atan}^{2}{\left(x \right)}}{x^{2} + 1}$$
-18*(-1 + x*atan(x))*atan(x)
----------------------------
2
/ 2\
\1 + x /
$$- \frac{18 \left(x \operatorname{atan}{\left(x \right)} - 1\right) \operatorname{atan}{\left(x \right)}}{\left(x^{2} + 1\right)^{2}}$$
/ 2 2 \
| 1 2 6*x*atan(x) 4*x *atan (x)|
18*|------ - atan (x) - ----------- + -------------|
| 2 2 2 |
\1 + x 1 + x 1 + x /
----------------------------------------------------
2
/ 2\
\1 + x /
$$\frac{18 \cdot \left(\frac{4 x^{2} \operatorname{atan}^{2}{\left(x \right)}}{x^{2} + 1} - \operatorname{atan}^{2}{\left(x \right)} - \frac{6 x \operatorname{atan}{\left(x \right)}}{x^{2} + 1} + \frac{1}{x^{2} + 1}\right)}{\left(x^{2} + 1\right)^{2}}$$