/ _____\ asin\\/ 4*x /
asin(sqrt(4*x))
1 ----------------- ___ _________ \/ x *\/ 1 - 4*x
2 1 ------- - --- 1 - 4*x 2*x ----------------- ___ _________ \/ x *\/ 1 - 4*x
12 3 2 ---------- + ---- - ----------- 2 2 x*(1 - 4*x) (1 - 4*x) 4*x ------------------------------- ___ _________ \/ x *\/ 1 - 4*x