Let me take the derivative of that and put it over the derivative of that and then take the limit. And maybe L'Hopital's Rule will help us on the next stage. So let's see if it gets us anywhere. So this should be equal to the limit, if L'Hopital's Rule applies here, we're not 100% sure yet. This should be equal to the limit as x approaches 0 of the derivative of that thing over the derivative of that thing. So what's the derivative of 2 cosine of x? Well, the derivative of cosine of x is negative sine of x.