4*x
--------- + atan(4*x)
2
1 + 16*x
$$\frac{4 x}{16 x^{2} + 1} + \operatorname{atan}{\left (4 x \right )}$$
/ 2 \
| 16*x |
8*|1 - ---------|
| 2|
\ 1 + 16*x /
-----------------
2
1 + 16*x
$$\frac{- \frac{128 x^{2}}{16 x^{2} + 1} + 8}{16 x^{2} + 1}$$
/ 2 \
| 16*x |
512*x*|-1 + ---------|
| 2|
\ 1 + 16*x /
----------------------
2
/ 2\
\1 + 16*x /
$$\frac{512 x}{\left(16 x^{2} + 1\right)^{2}} \left(\frac{16 x^{2}}{16 x^{2} + 1} - 1\right)$$