/ ___\ / ___\ / ___\ / ___\ | 1 I*\/ 3 | | 1 I*\/ 3 | | 1 I*\/ 3 | | 1 I*\/ 3 | (a + 1)*(a - 1)*|a + - + -------|*|a + - - -------|*|a + - - + -------|*|a + - - - -------| \ 2 2 / \ 2 2 / \ 2 2 / \ 2 2 /
/ 2\ / 2 \ (1 + a)*(-1 + a)*\1 + a + a /*\1 + a - a/