But with that said, pause this video and say, hey, can I express g of x as a composition of two other functions? Let's say an f and an h of x. So there's a couple of ways that you could think about it. You could say, all right, let's see, I have this sine of x right over here. So what if I called that an f of x? So let's say I call that, well, actually, let me use a different variable so we don't get confused here. Let me call this u of x, the sine of x right over there.