to get a free desk copy of your calc book, look up your publisher’s rep for your area on their website and call and request one. they will send it to you for free and (if you ask) will give you supplementary teaching materials as well. DON’T SPEND YOUR OWN MONEY ON TEXTBOOKS YOU TEACH FROM.
Continuous Everywhere but Differentiable Nowhere 
to get a free desk copy of your calc book, look up your publisher’s rep for your area on their website and call and request one. they will send it to you for free and (if you ask) will give you supplementary teaching materials as well. DON’T SPEND YOUR OWN MONEY ON TEXTBOOKS YOU TEACH FROM.