asin(2*x)
2 ------------- __________ / 2 \/ 1 - 4*x
8*x ------------- 3/2 / 2\ \1 - 4*x /
/ 2 \ | 12*x | 8*|1 + --------| | 2| \ 1 - 4*x / ---------------- 3/2 / 2\ \1 - 4*x /