How did loving the ground-up toenails of bisexuals get an interior designer to take up geology? Simple, he went from noting decor to what the core denotes by being into grated bi-parts.
I don’t really get why this XKCD is funny.
But here is a picture explaining integration by parts:
The area of the entire rectangle is , and it is made of two parts we integrate, so
Also, take and you find
which is the product rule.