And we said, hey, we could find the slope of the tangent line if we just take the limit of this as it approaches, as h approaches 0. Limit as h approaches 0. And then we'll be finding the slope of the tangent line. Now let's apply this idea to a particular function, y, or f of x is equal to x squared, or y is equal to x squared. So here we could consider this to be the point x squared. So f of x is just equal to x squared. And then this would be the point.