/ 3 2 \
| cos (x) cos(x) 6*x 2*atan(x) 8*x *atan(x)|
2*|- ------- - ------ - --------- - --------- + ------------|
| 3 sin(x) 3 2 3 |
| sin (x) / 2\ / 2\ / 2\ |
\ \1 + x / \1 + x / \1 + x / /
$$2 \left(\frac{8 x^{2} \operatorname{atan}{\left(x \right)}}{\left(x^{2} + 1\right)^{3}} - \frac{6 x}{\left(x^{2} + 1\right)^{3}} - \frac{\cos{\left(x \right)}}{\sin{\left(x \right)}} - \frac{\cos^{3}{\left(x \right)}}{\sin^{3}{\left(x \right)}} - \frac{2 \operatorname{atan}{\left(x \right)}}{\left(x^{2} + 1\right)^{2}}\right)$$