/ 1 \
| 1 - ----------- |
| 2 / 1 \ |
| x *|1 + --| |
| | 2| |
| 2 \ x / /1\|
2*|- ---------- + --------------- + atan|-||
| / 1 \ / 1 \ \x/|
| x*|1 + --| x*|1 + --| |
| | 2| | 2| |
\ \ x / \ x / /
$$2 \left(\operatorname{atan}{\left(\frac{1}{x} \right)} + \frac{1 - \frac{1}{x^{2} \left(1 + \frac{1}{x^{2}}\right)}}{x \left(1 + \frac{1}{x^{2}}\right)} - \frac{2}{x \left(1 + \frac{1}{x^{2}}\right)}\right)$$
/ 1 4 \
2*|----------- - ------------|
| 2 / 1 \ 2|
|x *|1 + --| 4 / 1 \ |
| | 2| x *|1 + --| |
| \ x / | 2| |
\ \ x / /
------------------------------
2 / 1 \
x *|1 + --|
| 2|
\ x /
$$\frac{2 \left(\frac{1}{x^{2} \left(1 + \frac{1}{x^{2}}\right)} - \frac{4}{x^{4} \left(1 + \frac{1}{x^{2}}\right)^{2}}\right)}{x^{2} \left(1 + \frac{1}{x^{2}}\right)}$$