1 / 1\
- ---------- + atan|1*-|
/ 1 \ \ x/
x*|1 + --|
| 2|
\ x /
$$\operatorname{atan}{\left(1 \cdot \frac{1}{x} \right)} - \frac{1}{x \left(1 + \frac{1}{x^{2}}\right)}$$
-2
------------
2
4 / 1 \
x *|1 + --|
| 2|
\ x /
$$- \frac{2}{x^{4} \left(1 + \frac{1}{x^{2}}\right)^{2}}$$
/ 4 4 \
2*|- ------------ + -----------|
| 2 2 / 1 \|
| 4 / 1 \ x *|1 + --||
| x *|1 + --| | 2||
| | 2| \ x /|
\ \ x / /
--------------------------------
3 / 1 \
x *|1 + --|
| 2|
\ x /
$$\frac{2 \cdot \left(\frac{4}{x^{2} \cdot \left(1 + \frac{1}{x^{2}}\right)} - \frac{4}{x^{4} \left(1 + \frac{1}{x^{2}}\right)^{2}}\right)}{x^{3} \cdot \left(1 + \frac{1}{x^{2}}\right)}$$