Whoops, I lost my screen. Here we go. So we could write f prime of e is equal to the limit as h approaches 0 of natural log, I'll do the same color so we can keep track of things, natural log of e plus h, I'll just leave that blank for now, minus the natural log of e, all of that over h. So just like that, this right over here, if we evaluate this limit, if we're able to, and we actually can, if we're able to evaluate this limit, this would give us the slope of the tangent line when x equals e. This is doing the formal definition. Now let's do the alternate definition. The alternate definition, if you don't want to find a general derivative expressed as a function of x like this, and you just want to find the slope at a particular point, the alternate definition kind of just gets straight to the point there. So what they say is, hey, look, let's imagine some other x value here. So let's imagine some other x value.