/ 3 6 / 3\\
| / 3\ 3*x 6*x *atan\x /|
6*x*|2*atan\x / + ------ - -------------|
| 6 6 |
\ 1 + x 1 + x /
-----------------------------------------
6
1 + x
$$\frac{6 x \left(- \frac{6 x^{6} \operatorname{atan}{\left(x^{3} \right)}}{x^{6} + 1} + \frac{3 x^{3}}{x^{6} + 1} + 2 \operatorname{atan}{\left(x^{3} \right)}\right)}{x^{6} + 1}$$
/ 9 3 6 / 3\ 12 / 3\ \
| 27*x 9*x 27*x *atan\x / 36*x *atan\x / / 3\|
12*|- --------- + ------ - -------------- + --------------- + atan\x /|
| 2 6 6 2 |
| / 6\ 1 + x 1 + x / 6\ |
\ \1 + x / \1 + x / /
-----------------------------------------------------------------------
6
1 + x
$$\frac{12 \left(\frac{36 x^{12} \operatorname{atan}{\left(x^{3} \right)}}{\left(x^{6} + 1\right)^{2}} - \frac{27 x^{9}}{\left(x^{6} + 1\right)^{2}} - \frac{27 x^{6} \operatorname{atan}{\left(x^{3} \right)}}{x^{6} + 1} + \frac{9 x^{3}}{x^{6} + 1} + \operatorname{atan}{\left(x^{3} \right)}\right)}{x^{6} + 1}$$