A fire, fire, fire, not a hydrant. That would be a noisy hydrant. There's a fire truck outside. But okay, I think it's passed. But this looks like what she got for the derivative, because if you multiply two times two x, you do indeed get four x. You have this three right over here in the denominator, and x squared minus one to the negative one-third, that's the same thing as x squared minus one to the one-third in the denominator, which is the same thing as the cube root of x squared minus one. So all of this is looking good.