asin(x) -------*x 2
(asin(x)/2)*x
asin(x) x ------- + ------------- 2 ________ / 2 2*\/ 1 - x
2 x 1 + ---------- / 2\ 2*\1 - x / -------------- ________ / 2 \/ 1 - x
/ 2 \ | 3*x | x*|4 - -------| | 2| \ -1 + x / --------------- 3/2 / 2\ 2*\1 - x /