/ ___\ acos\\/ x /
d / / ___\\ --\acos\\/ x // dx
-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