2
-3*x
------------------
/ 6\ 2/ 3\
\1 + x /*atan \x /
$$- \frac{3 x^{2}}{\left(x^{6} + 1\right) \operatorname{atan}^{2}{\left(x^{3} \right)}}$$
/ 6 3 \
| 3*x 3*x |
6*x*|-1 + ------ + -----------------|
| 6 / 6\ / 3\|
\ 1 + x \1 + x /*atan\x //
-------------------------------------
/ 6\ 2/ 3\
\1 + x /*atan \x /
$$\frac{6 x \left(\frac{3 x^{6}}{x^{6} + 1} + \frac{3 x^{3}}{\left(x^{6} + 1\right) \operatorname{atan}{\left(x^{3} \right)}} - 1\right)}{\left(x^{6} + 1\right) \operatorname{atan}^{2}{\left(x^{3} \right)}}$$
/ 6 12 3 6 9 \
| 27*x 36*x 18*x 27*x 54*x |
-6*|1 - ------ + --------- - ----------------- + ------------------- + ------------------|
| 6 2 / 6\ / 3\ 2 2 |
| 1 + x / 6\ \1 + x /*atan\x / / 6\ 2/ 3\ / 6\ / 3\|
\ \1 + x / \1 + x / *atan \x / \1 + x / *atan\x //
------------------------------------------------------------------------------------------
/ 6\ 2/ 3\
\1 + x /*atan \x /
$$- \frac{6 \cdot \left(\frac{36 x^{12}}{\left(x^{6} + 1\right)^{2}} + \frac{54 x^{9}}{\left(x^{6} + 1\right)^{2} \operatorname{atan}{\left(x^{3} \right)}} - \frac{27 x^{6}}{x^{6} + 1} + \frac{27 x^{6}}{\left(x^{6} + 1\right)^{2} \operatorname{atan}^{2}{\left(x^{3} \right)}} - \frac{18 x^{3}}{\left(x^{6} + 1\right) \operatorname{atan}{\left(x^{3} \right)}} + 1\right)}{\left(x^{6} + 1\right) \operatorname{atan}^{2}{\left(x^{3} \right)}}$$