/ ___\ / ___\ | 1 \/ 3 | | 1 \/ 3 | (x + 1)*x*|x + - - + -----|*|x + - - - -----| \ 2 2 / \ 2 2 /
2 / 3 \ x *\7 - 14*x + 21*x/
2 / 2\ -7*x *(1 + x)*\-1 - 2*x + 2*x /
5 2 3 - 14*x + 7*x + 21*x
2 / 3 \ 7*x *\1 - 2*x + 3*x/