Instruct: Classify Amazon reviews into positive or negative sentiment
Query: One of the worst textbooks I've used.

I'm an engineering student currently going to school in Utah. This book is one of the worst I've used. The sections give hardly any explantation on the subjects they are trying to teach. The examples have hardly any relevancy to the problems. Some of the equations in the front cover are wrong. And the answers in the back of the book are wrong quite often.My biggest complaint is with the actual sections. They do little more than offer proofs for the equations that go with the new material, then send you on your merry way. All fine and dandy, but I'd like a little more explanation given, such as when I can't use an equation given some circumstances. I've wasted many, many hours on problems because the equations I've used were the wrong ones to use.If you have to use this book, get the solutions manual. It will save you a lot of time and stress.