Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
수학에서 반직선은 한쪽 방향으로만 무한히 연장됩니다.suhakeseo banjigseoneun hanjjok banghyang-euro-man muhanhi yeonjangdoemnida.In mathematics, a half line extends infinitely in one direction only.