They ask you to find a difficult limit that when you just plug the numbers in, you get something like this. L'Hopital's Rule is normally what they are testing you for. In a future video, I might prove it, but that gets a little bit more involved. The application is actually reasonably straightforward. What L'Hopital's Rule tells us is that if we have, and I'll do it in abstract form first, but I think when I show you the example, it will all be made clear. If the limit as x approaches c of f of x is equal to 0, and the limit as x approaches c of g of x is equal to 0, and the limit as x approaches c of f prime of x over g prime of x exists and it equals L, then all of these conditions have to be met. This is the indeterminate form of 0 over 0, so this is the first case.