You are the best Math teacher ever !! I am a 42 year-old Old Student living in the States. I've been watching your videos for over a year and got a lot of help. I got an A in the Trigonometry this Spring semester. I am going to learn Precalculus this summer semester. I don't know what I'm going to learn yet, but I'm going to find and watch the videos you uploaded. Thank you so much for providing such a good lecture. I also recommended your videos to my son and daughter who are high school students.
![[새교육과정 기하] 5강 쌍곡선의 방정식 개념설명](http://i.ytimg.com/vi/lEGqWH5ctbA/mqdefault.jpg)
![[새교육과정 기하] 5강 쌍곡선의 방정식 개념설명](/img/tr.png)
![개념원리 기하 [ 02. 타원의 방정식 ] [ 이차곡선 ]](http://i.ytimg.com/vi/DLn9EXF0nAI/mqdefault.jpg)
You are the best Math teacher ever !! I am a 42 year-old Old Student living in the States. I've been watching your videos for over a year and got a lot of help. I got an A in the Trigonometry this Spring semester. I am going to learn Precalculus this summer semester. I don't know what I'm going to learn yet, but I'm going to find and watch the videos you uploaded. Thank you so much for providing such a good lecture. I also recommended your videos to my son and daughter who are high school students.