Can you check if they really used the log in the integral and the ln in the answer ? That's pretty weird.
All I have down for an answer is (ln2)^2. I don't have a solutions manual. Either way, that answer minus my last error, is not equal. Is my work correct aside from that?
Another solution manual error?
The problem in that is I don't know what log stands for, because it depends on the books !
So, assuming that this "log" is base 10, the answer is
If this "log" is the napierian (natural) logarithm, then the answer is simply
Your work is correct aside that. There's just the confusion log / ln that just affects the result.