/ 2 \
| 1 36*x 9*x |
54*|-1 + --------------------- + -------- + --------------------|
| / 2\ 2 2 / 2\ |
\ \1 + 9*x /*atan (3*x) 1 + 9*x \1 + 9*x /*atan(3*x)/
-----------------------------------------------------------------
2
/ 2\
\1 + 9*x / *atan(3*x)
$$\frac{54 \left(\frac{36 x^{2}}{9 x^{2} + 1} + \frac{9 x}{\left(9 x^{2} + 1\right) \operatorname{atan}{\left(3 x \right)}} - 1 + \frac{1}{\left(9 x^{2} + 1\right) \operatorname{atan}^{2}{\left(3 x \right)}}\right)}{\left(9 x^{2} + 1\right)^{2} \operatorname{atan}{\left(3 x \right)}}$$