Pause the video and see if you can figure out what that's going to be. Well, one way to think about it, cotangent of x, it's one over tangent of x, it's cosine of x over sine of x. It's sine of x. This is the limit as x approaches pi of this. And is pi in the domain of cotangent of x? Well, no, if you were to just substitute pi in, you're gonna get negative one over zero. And so that is not in the domain of cotangent of x.