One over natural log of a, that's just a number. So we're gonna get one over the natural log of a times the derivative, times the derivative with respect to x of natural log of x, of natural log of x, which we already know is one over x. So this thing right over here is one over x. So what we get is one over natural log of a times one over x, which we could write as one over natural log of a times x, times x, which is a really useful thing to know. So now we could take all sorts of derivatives. So if I were to tell you f of x is equal to log base seven of x, well, now we could say, well, f prime of x is going to be one over the natural log of seven times x. If we had a constant out front, if we had, for example, g of x, g of x is equal to negative three times log base, I don't know, log base pi.