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

Examples
with 여현.

  • 삼각형의 각도를 구할 때 여현을 사용합니다.samgak-hyeong-ui gakdoreul guhal ttae yeohyeon-eul sayonghamnida.We use cos to calculate the angles of a triangle.