/ 2 \
9*cos(9*x) \2 + 2*cot (2*x + 1)/*sin(9*x)
------------ + ------------------------------
cot(2*x + 1) 2
cot (2*x + 1)
$$\frac{\left(2 \cot^{2}{\left(2 x + 1 \right)} + 2\right) \sin{\left(9 x \right)}}{\cot^{2}{\left(2 x + 1 \right)}} + \frac{9 \cos{\left(9 x \right)}}{\cot{\left(2 x + 1 \right)}}$$
/ 2 \ / 2 \
/ 2 \ | 1 + cot (1 + 2*x)| 36*\1 + cot (1 + 2*x)/*cos(9*x)
-81*sin(9*x) + 8*\1 + cot (1 + 2*x)/*|-1 + -----------------|*sin(9*x) + -------------------------------
| 2 | cot(1 + 2*x)
\ cot (1 + 2*x) /
--------------------------------------------------------------------------------------------------------
cot(1 + 2*x)
$$\frac{8 \left(\frac{\cot^{2}{\left(2 x + 1 \right)} + 1}{\cot^{2}{\left(2 x + 1 \right)}} - 1\right) \left(\cot^{2}{\left(2 x + 1 \right)} + 1\right) \sin{\left(9 x \right)} + \frac{36 \left(\cot^{2}{\left(2 x + 1 \right)} + 1\right) \cos{\left(9 x \right)}}{\cot{\left(2 x + 1 \right)}} - 81 \sin{\left(9 x \right)}}{\cot{\left(2 x + 1 \right)}}$$
/ 2 \
/ 2 \ | 1 + cot (1 + 2*x)|
/ 2 3\ 216*\1 + cot (1 + 2*x)/*|-1 + -----------------|*cos(9*x)
| / 2 \ / 2 \ | / 2 \ | 2 |
729*cos(9*x) | 2 5*\1 + cot (1 + 2*x)/ 3*\1 + cot (1 + 2*x)/ | 486*\1 + cot (1 + 2*x)/*sin(9*x) \ cot (1 + 2*x) /
- ------------ + 16*|2 + 2*cot (1 + 2*x) - ---------------------- + ----------------------|*sin(9*x) - -------------------------------- + ---------------------------------------------------------
cot(1 + 2*x) | 2 4 | 2 cot(1 + 2*x)
\ cot (1 + 2*x) cot (1 + 2*x) / cot (1 + 2*x)
$$\frac{216 \left(\frac{\cot^{2}{\left(2 x + 1 \right)} + 1}{\cot^{2}{\left(2 x + 1 \right)}} - 1\right) \left(\cot^{2}{\left(2 x + 1 \right)} + 1\right) \cos{\left(9 x \right)}}{\cot{\left(2 x + 1 \right)}} - \frac{486 \left(\cot^{2}{\left(2 x + 1 \right)} + 1\right) \sin{\left(9 x \right)}}{\cot^{2}{\left(2 x + 1 \right)}} + 16 \left(\frac{3 \left(\cot^{2}{\left(2 x + 1 \right)} + 1\right)^{3}}{\cot^{4}{\left(2 x + 1 \right)}} - \frac{5 \left(\cot^{2}{\left(2 x + 1 \right)} + 1\right)^{2}}{\cot^{2}{\left(2 x + 1 \right)}} + 2 \cot^{2}{\left(2 x + 1 \right)} + 2\right) \sin{\left(9 x \right)} - \frac{729 \cos{\left(9 x \right)}}{\cot{\left(2 x + 1 \right)}}$$