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