Imagine you're the author, and you have to explain derivatives in 100 pages, because your boss asked you to make the book 1000+ pages long. Including definition

Imagine you're the author, and you have to explain derivatives in 100 pages, because your boss asked you to make the book 1000+ pages long. Including definitions, formulas, examples, and problems, you could get to 30 pages. You'd think it's impossible to write 70pp of padding, yet somehow they make it happen... So students are double the victims: they pay through the nose, and they get 100pp of crappy explanations, where 30pp would do.