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