/ ___\ acos\\/ x /
acos(sqrt(x))
-1 ----------------- ___ _______ 2*\/ x *\/ 1 - x
1 1 - - ----- x 1 - x ----------------- ___ _______ 4*\/ x *\/ 1 - x
3 3 2 - -- - -------- + --------- 2 2 x*(1 - x) x (1 - x) --------------------------- ___ _______ 8*\/ x *\/ 1 - x