So the second expression, we could take the derivative of the inside, which is just 4x to the third, this derivative of 27 is just 0. So times 4x to the third, times the derivative of this whole thing with respect to the inside. So times, so you take this exponent, put it out front. So times minus 1, times this whole thing, x to the fourth plus 27, to the, we decrement this by 1 more, so minus 2. So let's see if I can simplify this expression a little bit. So this is equal to, so this right here is equal to 12x squared over this thing, x to the fourth plus 27. And then let's see, we're going to have a minus here, so it's minus, you multiply these two guys, 4 times 4 is 16.