atan(5*x) 5*x
--------- + -------------
2 / 2\
2*\1 + 25*x /
$$\frac{5 x}{2 \left(25 x^{2} + 1\right)} + \frac{\operatorname{atan}{\left(5 x \right)}}{2}$$
/ 2 \
| 25*x |
5*|1 - ---------|
| 2|
\ 1 + 25*x /
-----------------
2
1 + 25*x
$$\frac{5 \left(- \frac{25 x^{2}}{25 x^{2} + 1} + 1\right)}{25 x^{2} + 1}$$
/ 2 \
| 100*x |
125*x*|-4 + ---------|
| 2|
\ 1 + 25*x /
----------------------
2
/ 2\
\1 + 25*x /
$$\frac{125 x \left(\frac{100 x^{2}}{25 x^{2} + 1} - 4\right)}{\left(25 x^{2} + 1\right)^{2}}$$