/ -b \ acos\E *x/
acos(E^(-b)*x)
-b -e ----------------- ______________ / 2 -2*b \/ 1 - x *e
-3*b -x*e ----------------- 3/2 / 2 -2*b\ \1 - x *e /
/ 2 -2*b \ | 3*x *e | -3*b -|1 + ------------|*e | 2 -2*b| \ 1 - x *e / -------------------------- 3/2 / 2 -2*b\ \1 - x *e /