I thought that would be funny, and I kinda still do, but I also feel like it was mean. You are an intelligent woman who has taken the time to explain a difficult subject and have probably helped a number of students who were struggling. Anyways I don't know if you will even read these comments, but if you do i would like to apologize.
i think the second derivative is wrong..lower time the derivative of upper - upper times the derivative of lower all over lower squared right?? in your video you take the derivative of upper first..is that correct?? :D just asking.. :D in 4:37
Do you go to a boring lecture and it seems like the teacher does not understand. This is how i feel I learn more from that tutor guy on you tube than any college I have attended