/3 ___\ acot\\/ x /
-1 ----------------- 2/3 / 2/3\ 3*x *\1 + x /
/ 1 1 \ 2*|---- + ------------| | 5/3 / 2/3\| \x x*\1 + x // ----------------------- / 2/3\ 9*\1 + x /
/ 5 4 5 \ -2*|---- + ---------------- + -------------| | 8/3 2 2 / 2/3\| |x 4/3 / 2/3\ x *\1 + x /| \ x *\1 + x / / -------------------------------------------- / 2/3\ 27*\1 + x /