/ 6*sin(2*x) 27*x*cos(2*x)\
-2*|2*atan(3*x)*cos(2*x) + ---------- + -------------|
| 2 2 |
| 1 + 9*x / 2\ |
\ \1 + 9*x / /
$$- 2 \left(\frac{27 x \cos{\left(2 x \right)}}{\left(9 x^{2} + 1\right)^{2}} + 2 \cos{\left(2 x \right)} \operatorname{atan}{\left(3 x \right)} + \frac{6 \sin{\left(2 x \right)}}{9 x^{2} + 1}\right)$$
/ / 2 \ \
| | 36*x | |
| 27*|-1 + --------|*cos(2*x) |
| | 2| |
| 18*cos(2*x) \ 1 + 9*x / 162*x*sin(2*x)|
2*|- ----------- + 4*atan(3*x)*sin(2*x) + --------------------------- + --------------|
| 2 2 2 |
| 1 + 9*x / 2\ / 2\ |
\ \1 + 9*x / \1 + 9*x / /
$$2 \left(\frac{162 x \sin{\left(2 x \right)}}{\left(9 x^{2} + 1\right)^{2}} + 4 \sin{\left(2 x \right)} \operatorname{atan}{\left(3 x \right)} - \frac{18 \cos{\left(2 x \right)}}{9 x^{2} + 1} + \frac{27 \left(\frac{36 x^{2}}{9 x^{2} + 1} - 1\right) \cos{\left(2 x \right)}}{\left(9 x^{2} + 1\right)^{2}}\right)$$