/ /3\\
| 18*atan|-||
| /3\ 3 \x/|
6*|2*atan|-| + ---------- - -----------|
| \x/ / 9 \ 2 / 9 \|
| x*|1 + --| x *|1 + --||
| | 2| | 2||
\ \ x / \ x //
----------------------------------------
3 / 9 \
x *|1 + --|
| 2|
\ x / $$\frac{1}{x^{3} \left(1 + \frac{9}{x^{2}}\right)} \left(12 \operatorname{atan}{\left (\frac{3}{x} \right )} + \frac{18}{x \left(1 + \frac{9}{x^{2}}\right)} - \frac{108 \operatorname{atan}{\left (\frac{3}{x} \right )}}{x^{2} \left(1 + \frac{9}{x^{2}}\right)}\right)$$
/ /3\ /3\\
| 108*atan|-| 21*atan|-||
| /3\ 3 27 \x/ \x/|
36*|- atan|-| - ---------- + ------------ - ------------ + -----------|
| \x/ / 9 \ 2 2 2 / 9 \|
| x*|1 + --| 3 / 9 \ 4 / 9 \ x *|1 + --||
| | 2| x *|1 + --| x *|1 + --| | 2||
| \ x / | 2| | 2| \ x /|
\ \ x / \ x / /
-----------------------------------------------------------------------
4 / 9 \
x *|1 + --|
| 2|
\ x / $$\frac{1}{x^{4} \left(1 + \frac{9}{x^{2}}\right)} \left(- 36 \operatorname{atan}{\left (\frac{3}{x} \right )} - \frac{108}{x \left(1 + \frac{9}{x^{2}}\right)} + \frac{756 \operatorname{atan}{\left (\frac{3}{x} \right )}}{x^{2} \left(1 + \frac{9}{x^{2}}\right)} + \frac{972}{x^{3} \left(1 + \frac{9}{x^{2}}\right)^{2}} - \frac{3888 \operatorname{atan}{\left (\frac{3}{x} \right )}}{x^{4} \left(1 + \frac{9}{x^{2}}\right)^{2}}\right)$$