And they want us to evaluate the derivative of capital F at x equals negative one. So the way that we can do that is let's just take the derivative of capital F and then evaluate it as at x equals one. And the way they've set up capital F, this function definition, we can see that it is the quotient of two functions. So if we want to take its derivative, you might say, well maybe the quotient rule is important here. And I'll always give you my aside. The quotient rule, I'm gonna state it right now, and it could be useful to know it, but in case you ever forget it, you can derive it pretty quickly from the product rule, and if you know it, the chain rule combined, you can get the quotient rule pretty quick. But let me just state the quotient rule right now.