4
-15*acot (3*x)
--------------
2
1 + 9*x
$$- \frac{15 \operatorname{acot}^{4}{\left(3 x \right)}}{9 x^{2} + 1}$$
3
90*acot (3*x)*(2 + 3*x*acot(3*x))
---------------------------------
2
/ 2\
\1 + 9*x /
$$\frac{90 \cdot \left(3 x \operatorname{acot}{\left(3 x \right)} + 2\right) \operatorname{acot}^{3}{\left(3 x \right)}}{\left(9 x^{2} + 1\right)^{2}}$$
/ 2 2 \
2 | 2 6 36*x*acot(3*x) 36*x *acot (3*x)|
270*acot (3*x)*|acot (3*x) - -------- - -------------- - ----------------|
| 2 2 2 |
\ 1 + 9*x 1 + 9*x 1 + 9*x /
--------------------------------------------------------------------------
2
/ 2\
\1 + 9*x /
$$\frac{270 \left(- \frac{36 x^{2} \operatorname{acot}^{2}{\left(3 x \right)}}{9 x^{2} + 1} + \operatorname{acot}^{2}{\left(3 x \right)} - \frac{36 x \operatorname{acot}{\left(3 x \right)}}{9 x^{2} + 1} - \frac{6}{9 x^{2} + 1}\right) \operatorname{acot}^{2}{\left(3 x \right)}}{\left(9 x^{2} + 1\right)^{2}}$$