Pause this video and try to figure it out. So at first you might say, how does the power rule apply here? The power rule, just to remind ourselves, it tells us that if we're taking the derivative of x to the n with respect to x, so if we're taking the derivative of that, that that's going to be equal to, we take the exponent, bring it out front, and we've proven it in other videos, but this is going to be n times x to the, and then we decrement the exponent, so n minus one. But this does not look like that, and the key is to appreciate that one over x is the same thing as x to the negative one. So this is going to be the derivative with respect to x of x to the negative one. And now this looks a lot more like what you might be used to where this is going to be equal to, you take our exponent, bring it out front, so that's negative one, times x to the negative one minus one, negative one minus one, and so this is going to be equal to negative x to the negative two, and we're done. Let's do another example.