Hellow guys, Welcome to my website, and you are watching #11. 기본정석 수학1 │ 9단원 삼각함수의 그래프(1). and this vIdeo is uploaded by 김강용: 심화와 응용에 강한 수학 at 2018-08-14T16:31:46-07:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.