Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Ridiculous!

I had this book for three terms of calculus, and it was a headache. For every one person who liked the book, there were fifty who didn't. The authors, in trying to take a "leaner, more conceptual approach" to calculus, thoroughly confuse. The chapters on series and sequences are impossible to understand, and no practical problems are included in them. A good textbook supplements the material presented in lecture, and this one certainly did not. To summarize: this book presents calculus in a way that makes it seem far, far more complicated than it really is. And, to top it off, this is an *experimental* textbook that has been around for years. Time to conclude the experiment; it failed!