Once again, opposite of what you would expect. That starts with an S, this starts with a C. That starts with a C, that starts with an S. Just the way that it happened to be defined. But anyway, let's just evaluate this. Once again, we'll do the quotient rule, but you could also do this using the chain rule. So it's going to be the derivative of the expression on top, which is zero, times the expression on the bottom, which is sine of x, sine of x, minus the expression on top, which is just one, times the derivative of the expression on the bottom, which is cosine of x, all of that over the expression on the bottom squared. Sine squared of x, that's zero, so we get negative cosine of x over sine, over sine squared of x. So that's one way to think about it.