2*x
-------- + atan(2*x)
2
1 + 4*x
$$\frac{2 x}{4 x^{2} + 1} + \operatorname{atan}{\left(2 x \right)}$$
/ 2 \
| 4*x |
4*|1 - --------|
| 2|
\ 1 + 4*x /
----------------
2
1 + 4*x
$$\frac{4 \left(- \frac{4 x^{2}}{4 x^{2} + 1} + 1\right)}{4 x^{2} + 1}$$
/ 2 \
| 16*x |
16*x*|-4 + --------|
| 2|
\ 1 + 4*x /
--------------------
2
/ 2\
\1 + 4*x /
$$\frac{16 x \left(\frac{16 x^{2}}{4 x^{2} + 1} - 4\right)}{\left(4 x^{2} + 1\right)^{2}}$$