/ ___\ / ___\
| 1 I*\/ 3 | | 1 I*\/ 3 |
(x - 1/2)*|x + - + -------|*|x + - - -------|
\ 4 4 / \ 4 4 / / 2\
(-1 + 2*y)*\1 + 2*y + 4*y /
---------------------------
8