14*atan(7*x)
------------
2
1 + 49*x
$$\frac{14 \operatorname{atan}{\left(7 x \right)}}{49 x^{2} + 1}$$
98*(1 - 14*x*atan(7*x))
-----------------------
2
/ 2\
\1 + 49*x /
$$\frac{98 \left(- 14 x \operatorname{atan}{\left(7 x \right)} + 1\right)}{\left(49 x^{2} + 1\right)^{2}}$$
/ 2 \
| 21*x 196*x *atan(7*x)|
1372*|-atan(7*x) - --------- + ----------------|
| 2 2 |
\ 1 + 49*x 1 + 49*x /
------------------------------------------------
2
/ 2\
\1 + 49*x /
$$\frac{1372 \cdot \left(\frac{196 x^{2} \operatorname{atan}{\left(7 x \right)}}{49 x^{2} + 1} - \frac{21 x}{49 x^{2} + 1} - \operatorname{atan}{\left(7 x \right)}\right)}{\left(49 x^{2} + 1\right)^{2}}$$