-3*sin(3*t) - 6*cot(6*t)
2 36 - 9*cos(3*t) + 36*cot (6*t)
/ / 2 \ \ 27*\- 16*\1 + cot (6*t)/*cot(6*t) + sin(3*t)/
/ 2 \ | / 2 \ 2 / 2 \ | 81*\32*\1 + cot (6*t)/ + 64*cot (6*t)*\1 + cot (6*t)/ + cos(3*t)/