/1\ /1\
7*sin|-| acot(7*x)*cos|-|
\x/ \x/
- --------- - ----------------
2 2
1 + 49*x x
$$- \frac{7 \sin{\left(\frac{1}{x} \right)}}{49 x^{2} + 1} - \frac{\cos{\left(\frac{1}{x} \right)} \operatorname{acot}{\left(7 x \right)}}{x^{2}}$$
/ /1\\
| sin|-||
| /1\ \x/| /1\ /1\
|2*cos|-| - ------|*acot(7*x) 14*cos|-| 686*x*sin|-|
\ \x/ x / \x/ \x/
----------------------------- + -------------- + ------------
3 2 / 2\ 2
x x *\1 + 49*x / / 2\
\1 + 49*x /
$$\frac{686 x \sin{\left(\frac{1}{x} \right)}}{\left(49 x^{2} + 1\right)^{2}} + \frac{14 \cos{\left(\frac{1}{x} \right)}}{x^{2} \left(49 x^{2} + 1\right)} + \frac{\left(2 \cos{\left(\frac{1}{x} \right)} - \frac{\sin{\left(\frac{1}{x} \right)}}{x}\right) \operatorname{acot}{\left(7 x \right)}}{x^{3}}$$
/ /1\ /1\\
| cos|-| 6*sin|-|| / 2 \ / /1\\
| /1\ \x/ \x/| | 196*x | /1\ | sin|-||
|- 6*cos|-| + ------ + --------|*acot(7*x) /1\ 686*|-1 + ---------|*sin|-| | /1\ \x/|
| \x/ 2 x | 2058*cos|-| | 2| \x/ 21*|2*cos|-| - ------|
\ x / \x/ \ 1 + 49*x / \ \x/ x /
------------------------------------------ - -------------- - --------------------------- - ----------------------
4 2 2 3 / 2\
x / 2\ / 2\ x *\1 + 49*x /
x*\1 + 49*x / \1 + 49*x /
$$- \frac{686 \left(\frac{196 x^{2}}{49 x^{2} + 1} - 1\right) \sin{\left(\frac{1}{x} \right)}}{\left(49 x^{2} + 1\right)^{2}} - \frac{2058 \cos{\left(\frac{1}{x} \right)}}{x \left(49 x^{2} + 1\right)^{2}} - \frac{21 \left(2 \cos{\left(\frac{1}{x} \right)} - \frac{\sin{\left(\frac{1}{x} \right)}}{x}\right)}{x^{3} \left(49 x^{2} + 1\right)} + \frac{\left(- 6 \cos{\left(\frac{1}{x} \right)} + \frac{6 \sin{\left(\frac{1}{x} \right)}}{x} + \frac{\cos{\left(\frac{1}{x} \right)}}{x^{2}}\right) \operatorname{acot}{\left(7 x \right)}}{x^{4}}$$