Should you? Only if you are okay with an old edition and a sketchy file. Otherwise, spend the $15 on Cengage Unlimited. Consider it the cheapest insurance policy for passing the class.

You need the book. You need it now. And you’d prefer not to spend $150 on a new copy.

Because here is the secret: Whether you have a heavy hardcover or a scanned PDF, you still have to sit down and practice derivatives until 2 AM.

Good luck. And don’t forget the chain rule.