5 4
4 5 15*(x + 6) *acot (3*x)
5*(x + 6) *acot (3*x) - ----------------------
2
1 + 9*x
$$- \frac{15 \left(x + 6\right)^{5} \operatorname{acot}^{4}{\left(3 x \right)}}{9 x^{2} + 1} + 5 \left(x + 6\right)^{4} \operatorname{acot}^{5}{\left(3 x \right)}$$
/ 2 \
3 3 | 2 15*(6 + x)*acot(3*x) 9*(6 + x) *(2 + 3*x*acot(3*x))|
10*(6 + x) *acot (3*x)*|2*acot (3*x) - -------------------- + ------------------------------|
| 2 2 |
| 1 + 9*x / 2\ |
\ \1 + 9*x / /
$$10 \left(x + 6\right)^{3} \left(\frac{9 \left(x + 6\right)^{2} \left(3 x \operatorname{acot}{\left(3 x \right)} + 2\right)}{\left(9 x^{2} + 1\right)^{2}} - \frac{15 \left(x + 6\right) \operatorname{acot}{\left(3 x \right)}}{9 x^{2} + 1} + 2 \operatorname{acot}^{2}{\left(3 x \right)}\right) \operatorname{acot}^{3}{\left(3 x \right)}$$
/ / 2 2 \ \
| 3 | 2 6 36*x*acot(3*x) 36*x *acot (3*x)| |
| 9*(6 + x) *|- acot (3*x) + -------- + -------------- + ----------------| |
| 2 | 2 2 2 | 2 |
2 2 | 3 30*acot (3*x)*(6 + x) \ 1 + 9*x 1 + 9*x 1 + 9*x / 45*(6 + x) *(2 + 3*x*acot(3*x))*acot(3*x)|
30*(6 + x) *acot (3*x)*|2*acot (3*x) - --------------------- - ------------------------------------------------------------------------ + -----------------------------------------|
| 2 2 2 |
| 1 + 9*x / 2\ / 2\ |
\ \1 + 9*x / \1 + 9*x / /
$$30 \left(x + 6\right)^{2} \left(- \frac{9 \left(x + 6\right)^{3} \left(\frac{36 x^{2} \operatorname{acot}^{2}{\left(3 x \right)}}{9 x^{2} + 1} + \frac{36 x \operatorname{acot}{\left(3 x \right)}}{9 x^{2} + 1} - \operatorname{acot}^{2}{\left(3 x \right)} + \frac{6}{9 x^{2} + 1}\right)}{\left(9 x^{2} + 1\right)^{2}} + \frac{45 \left(x + 6\right)^{2} \left(3 x \operatorname{acot}{\left(3 x \right)} + 2\right) \operatorname{acot}{\left(3 x \right)}}{\left(9 x^{2} + 1\right)^{2}} - \frac{30 \left(x + 6\right) \operatorname{acot}^{2}{\left(3 x \right)}}{9 x^{2} + 1} + 2 \operatorname{acot}^{3}{\left(3 x \right)}\right) \operatorname{acot}^{2}{\left(3 x \right)}$$