/ 2 2 \
| 1 2 36*x*atan(6*x) 144*x *atan (6*x)|
1296*|--------- - atan (6*x) - -------------- + -----------------|
| 2 2 2 |
\1 + 36*x 1 + 36*x 1 + 36*x /
------------------------------------------------------------------
2
/ 2\
\1 + 36*x /
$$\frac{1}{\left(36 x^{2} + 1\right)^{2}} \left(\frac{186624 x^{2} \operatorname{atan}^{2}{\left (6 x \right )}}{36 x^{2} + 1} - \frac{46656 x \operatorname{atan}{\left (6 x \right )}}{36 x^{2} + 1} - 1296 \operatorname{atan}^{2}{\left (6 x \right )} + \frac{1296}{36 x^{2} + 1}\right)$$