log              184 math.c         #define log(x) ((x) < 0.0 ? nan() : log(x))
log              194 math.c             return rb_float_new(log(RFLOAT(x)->value));
log               47 missing/acosh.c     return log(x);
log               65 missing/acosh.c 	z = log(z + z);
log               68 missing/acosh.c 	z = log(z + sqrt(z * z + 1));
log               84 missing/acosh.c     z = log(z > 1 ? -1 : (1 + z) / (1 - z)) / 2;