So we have here f of x being equal to the natural log of the square root of x. And what we want to do in this video is find the derivative of f. And the key here is to recognize that f can actually be viewed as a composition of two functions. And we can diagram that out. What's going on here? Well, if you input an x into our function f, what's the first thing that you do? Well, you take the square root of it. So if we start off with some x, you input it, the first thing that you do is you take the square root of it.