asin(3*x)
d --(asin(3*x)) dx
3 ------------- __________ / 2 \/ 1 - 9*x
27*x ------------- 3/2 / 2\ \1 - 9*x /
/ 2 \ | 27*x | 27*|1 + --------| | 2| \ 1 - 9*x / ----------------- 3/2 / 2\ \1 - 9*x /