2
36 - 9*cos(3*t) + 36*cot (6*t)
$$- 9 \cos{\left(3 t \right)} + 36 \cot^{2}{\left(6 t \right)} + 36$$
/ / 2 \ \
27*\- 16*\1 + cot (6*t)/*cot(6*t) + sin(3*t)/
$$27 \left(- 16 \left(\cot^{2}{\left(6 t \right)} + 1\right) \cot{\left(6 t \right)} + \sin{\left(3 t \right)}\right)$$
/ 2 \
| / 2 \ 2 / 2 \ |
81*\32*\1 + cot (6*t)/ + 64*cot (6*t)*\1 + cot (6*t)/ + cos(3*t)/
$$81 \left(32 \left(\cot^{2}{\left(6 t \right)} + 1\right)^{2} + 64 \left(\cot^{2}{\left(6 t \right)} + 1\right) \cot^{2}{\left(6 t \right)} + \cos{\left(3 t \right)}\right)$$