2*asin(x) --------- 2
(2*asin(x))/2
1 ----------- ________ / 2 \/ 1 - x
x ----------- 3/2 / 2\ \1 - x /
/ 2 \ | 3*x | -|-1 + -------| | 2| \ -1 + x / ---------------- 3/2 / 2\ \1 - x /