1 ------ 2 x - x
1/(x - x^2)
-1 ---------- x*(-1 + x)
-1/(x*(-1 + x))
1/x - 1/(-1 + x)
1 1 - - ------ x -1 + x
-1 ------ 2 x - x
-1/(x^2 - x)
1 --------- x*(1 - x)
1/(x*(1 - x))