acos(2*x - 1)
-2 ------------------- ________________ / 2 \/ 1 - (2*x - 1)
-4*(-1 + 2*x) -------------------- 3/2 / 2\ \1 - (-1 + 2*x) /
/ 2 \ | 3*(-1 + 2*x) | -8*|1 + ---------------| | 2| \ 1 - (-1 + 2*x) / ------------------------ 3/2 / 2\ \1 - (-1 + 2*x) /