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