I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...

In this video series we will investigate the basics of what you will need to know to be successful in Pre-Calculus. We will ...

Of course this produces the same derivative values as the usual limit-based definitions of the derivative. What makes this possibly preferable to the usual formulas, though, is that it arises out of ...