I'll do it in green. Plus the indefinite integral, or the antiderivative, of 1 over a dA. Now, what is the antiderivative of e to the a? Well, we already know a little bit about exponentials. The derivative with respect to x of e to the x is equal to e to the x. That's one of the reasons why e and the exponential function in general is so amazing. And if we just replaced a with x, or x with a, you get the derivative with respect to a of e to the a is equal to e to the a.