The derivative with respect to x of x squared is just the power rule here. It's going to be two times x to the first power, or we could just say two x. Now, what's interesting is what we're doing right over here. The derivative with respect to x of y squared. And the realization here is to just apply the chain rule. If we're taking the derivative with respect to x of this something, we just have to take the derivative, let me make it clear, we're just gonna take the derivative of our something, the derivative of y squared, that's what we're taking, you can kind of view that as a function, with respect to y, with respect to y, and then multiply that times the derivative of y, the derivative of y with respect to x. We're assuming that y does change with respect to x. Y is not some type of a constant that we're writing just in abstract terms.