/atan(5*x)\
|---------|
\ 2 / x
----------- + --------------
25 / 2\
10*\1 + 25*x /
$$\frac{x}{10 \left(25 x^{2} + 1\right)} + \frac{\frac{1}{2} \operatorname{atan}{\left(5 x \right)}}{25}$$
2
1 5*x
- - ---------
5 2
1 + 25*x
-------------
2
1 + 25*x
$$\frac{- \frac{5 x^{2}}{25 x^{2} + 1} + \frac{1}{5}}{25 x^{2} + 1}$$
/ 2 \
| 100*x |
5*x*|-4 + ---------|
| 2|
\ 1 + 25*x /
--------------------
2
/ 2\
\1 + 25*x /
$$\frac{5 x \left(\frac{100 x^{2}}{25 x^{2} + 1} - 4\right)}{\left(25 x^{2} + 1\right)^{2}}$$