This entire indefinite integral we have simplified, we have evaluated it. And it is now equal to pi times the natural log, the natural log of the absolute value of u, but u is just the natural log of x. The natural log of x, and then we have this plus c right over here. And we could have assumed that from the get-go, this original expression was only defined for positive values of x, because you have to take the natural log here and it wasn't an absolute value. But now, so we can leave this as just a natural log of x. But this also works for the situations now, because we're taking the absolute value of that, where the natural log of x might have been a negative number. For example, if it was a natural log of.5, or who knows, whatever it might be.