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