So if we look at the outside here, we have the sign of something. So there's a sign of something going on here that I'm going to circle in red or in this pink color. So that's how my brain thinks about it. From the outside, I'm like, okay, big picture, I'm taking the sign of some stuff. I might be taking some stuff to some exponent. In this case, I'm inputting it into a trigonometric expression. But if you have a situation like that, it's a good sign that the chain rule is in order.