/ 2\ 2 + x*\1 + x /
/ 2 \ (1 + x)*\2 + x - x/
/ ___\ / ___\ | 1 I*\/ 7 | | 1 I*\/ 7 | (x + 1)*|x + - - + -------|*|x + - - - -------| \ 2 2 / \ 2 2 /