Can I no more see in a question whether I close-voted/down-voted it ? This would be annoying since the message "you have already down-/close-voted" would occur quite often. Hope this is a temporary problem and not one of those "great and necessary" changes like in the layout of the site.
This question about the integral test looks like a duplicate to me. I am hesitant to wield the golden hammer, therefore I left only a comment. There may be even better duplicate targets.