2*(3*x + 1)
3*atan(2*x) + -----------
2
1 + 4*x
$$\frac{2 \left(3 x + 1\right)}{4 x^{2} + 1} + 3 \operatorname{atan}{\left(2 x \right)}$$
/ 4*x*(1 + 3*x)\
4*|3 - -------------|
| 2 |
\ 1 + 4*x /
---------------------
2
1 + 4*x
$$\frac{4 \left(- \frac{4 x \left(3 x + 1\right)}{4 x^{2} + 1} + 3\right)}{4 x^{2} + 1}$$
/ / 2 \\
| | 16*x ||
16*|-9*x + (1 + 3*x)*|-1 + --------||
| | 2||
\ \ 1 + 4*x //
-------------------------------------
2
/ 2\
\1 + 4*x /
$$\frac{16 \left(- 9 x + \left(3 x + 1\right) \left(\frac{16 x^{2}}{4 x^{2} + 1} - 1\right)\right)}{\left(4 x^{2} + 1\right)^{2}}$$