And now I can divide both sides by two y. And I am going to get that the derivative of y with respect to x is equal to x, x over y. Now, the next step is let's take the derivative of both sides of this with respect to x. And then we can hopefully find our second derivative of y with respect to x. And to help us there, actually, let me rewrite this. And I always forget the quotient rule, although it might be a useful thing for you to remember. But I could rewrite this as a product, which will help me at least.