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
$$\frac{- \frac{16 x^{2}}{4 x^{2} + 1} + 4}{4 x^{2} + 1}$$
/ 2 \
| 4*x |
64*x*|-1 + --------|
| 2|
\ 1 + 4*x /
--------------------
2
/ 2\
\1 + 4*x /
$$\frac{64 x}{\left(4 x^{2} + 1\right)^{2}} \left(\frac{4 x^{2}}{4 x^{2} + 1} - 1\right)$$