[This Chapter is currently still in development, and so is closed. We should have it complete and open soon — please check back, or better yet, subscribe to our Forum and we’ll let you know when it’s ready!]

In this Chapter we introduce one of the two fundamental pillars of Calculus: the derivative. Its definition, and magic, rely heavily on the limit, which we explored extensively in the preceding Chapter. We’ll first build up our understanding of what the derivative means and what it tells us, and then start to develop some tools to be able to compute derivatives quickly and efficiently.