Now let's, and I would categorize what we've seen so far as the bulk of the limit exercises that you will likely encounter. Now the next two, I would call slightly fancier techniques. So if you get indeterminate form, especially you'll sometimes see it with radical expressions like this, rational radical expressions, you might want to multiply by a conjugate. So for example, in this situation right here, if you just tried to evaluate it at x equals four, you get the square root of four minus two over four minus four, which is zero over zero. So it's that indeterminate form and the technique here, because we're seeing this radical and irrational expression, is hey, let's maybe, maybe we can somehow get rid of that radical or simplify it somehow. So let me rewrite it. Square root of x minus two over x minus four.