/ 2\ (-1 + 2*x)*\1 - x + 4*x /
/ ____\ / ____\ | 1 I*\/ 15 | | 1 I*\/ 15 | (x - 1/2)*|x + - - + --------|*|x + - - - --------| \ 8 8 / \ 8 8 /
-1 + x*(3 + 2*x*(-3 + 4*x))