## C.1 Chain Rule – Introduction

You might have noticed that so far in this “Calculating Derivatives” chapter, we have only found the derivative of simple functions like $x^2,$ $\sin x,$ $e^x,$ and the product and quotient of such functions. We have not yet found the derivative of a function like $\sin (2x),$ or $e^{x^2}.$ There’s a reason for this: we… [read more]