Honestly I couldn't slog through the video. It started off with "let's use letters" and immediately got to things like "the right letters for this case are 'df' and 'dt'". This just feels like "here's a bunch of magic that you'll just have to memorize". Reminds me of my favorite quote:
> And then Satan said "put the alphabet in math".
When I learned the basics of calculus it was via simple problems that we wanted to answer. And for a while we estimated the answers by brute forcing approximations. I still drop back to this when I can't remember how to do something and need to re-discover parts of calculus.
> And then Satan said "put the alphabet in math".
When I learned the basics of calculus it was via simple problems that we wanted to answer. And for a while we estimated the answers by brute forcing approximations. I still drop back to this when I can't remember how to do something and need to re-discover parts of calculus.