And then to that, I'm going to add the derivative of this with respect to x. Well that's just going to be the second derivative of y with respect to x times this. And all I did is apply the product rule. Three y squared minus x. Once again, I'll say it the third time. Derivative of this times this plus the derivative of this times that. Alright, that's going to be equal to, on the right hand side, derivative of y with respect to x is just dy dx.