7*x
--------- + atan(7*x)
2
1 + 49*x
$$\frac{7 x}{49 x^{2} + 1} + \operatorname{atan}{\left (7 x \right )}$$
/ 2 \
| 49*x |
14*|1 - ---------|
| 2|
\ 1 + 49*x /
------------------
2
1 + 49*x
$$\frac{- \frac{686 x^{2}}{49 x^{2} + 1} + 14}{49 x^{2} + 1}$$
/ 2 \
| 49*x |
2744*x*|-1 + ---------|
| 2|
\ 1 + 49*x /
-----------------------
2
/ 2\
\1 + 49*x /
$$\frac{2744 x}{\left(49 x^{2} + 1\right)^{2}} \left(\frac{49 x^{2}}{49 x^{2} + 1} - 1\right)$$