Intermediate Value Theorem

Intermediate Value Theorem

A theorem that's in the top five of most useless things you'll learn (or not) in calculus. Unless your teacher tells you it's on the test. (And there may be a multiple choice question on the AP if you're taking that.) But even then you need to ask your teacher to get very specific about what problems you're supposed to be able to work with this thing, because it's never been obvious to me.