/ 5 5 4 1 3 3 \
2*|- ---- - ------------- - ---------------- - --------------------------- + --------------------------- + ----------------------------|
| 8/3 2 / 2/3\ 2 2 7/3 / 2/3\ /3 ___\ 2 |
| x x *\1 + x / 4/3 / 2/3\ 2 / 2/3\ 2/3 ___\ x *\1 + x /*acot\\/ x / 5/3 / 2/3\ /3 ___\|
\ x *\1 + x / x *\1 + x / *acot \\/ x / x *\1 + x / *acot\\/ x //
----------------------------------------------------------------------------------------------------------------------------------------
/ 2/3\ /3 ___\
27*\1 + x /*acot\\/ x /