acosl
long double acosl(long double);
extern long double acosl(long double);
using ::acosl;
extern long double acosl(long double);
inline long double acos(long double __X) { return acosl(__X); }
extern long double acosl(long double);
extern long double acosl(long double);
LD_RE(ans) = acosl(x);
LD_RE(ans) = acosl(x);
LD_RE(ans) = (hx >= 0)? acosl(B) : acosl(-B);