But we just say, OK, what's the derivative of sine of something with respect to that something? Well, that's cosine of that something. And then we go in one layer. What's the derivative of that something? Well, in that something, we have another composition. So the derivative of ln of x or ln of something with respect to another something, well, that's going to be 1 over the something. So we had gotten a 1 over x squared here.