And if any of this is looking unfamiliar again, don't watch this video. This video is for folks who are familiar with each of these derivative rules or derivative techniques and now wanna think about, well, what are strategies for deciding when to apply which? So let's do that. Let's say that I have the expression, let's say I'm interested in taking the derivative of x squared plus x minus two over x minus one. Which of these rules or techniques would you use? Well, you might immediately say, hey, look, this looks like a rational expression. I could say, look, I could say this is my f of x right over here.