So the derivative of f with respect to x is equal to, so the derivative of x minus one to the negative one with respect to x minus one, well, that's just going to be, we're just going to use the power rule here. It's gonna be negative one times x minus one to the negative two. And then we're gonna multiply that times the derivative of x minus one with respect to x. Well, that's just going to be one, right? The derivative of x with respect to x is one. The derivative of negative one with respect to x is zero. So we could say times one here if we like, or we could just not write that because it doesn't change the value.