___________ / 2*acos(x) lim x / --------- x->0+\/ pi
Limit(((2*acos(x))/pi)^(1/x), x, 0)
___________ / 2*acos(x) lim x / --------- x->0+\/ pi
-2 --- pi e
= 0.529077808267735
___________ / 2*acos(x) lim x / --------- x->0-\/ pi
-2 --- pi e
= 0.529077808267735
= 0.529077808267735