Instruct: Classify the given review into positive or negative sentiment.
Query: Too many errors and mistakes

I agree with Benoit Launier; this book simply has too many errors and mistakes it makes it more difficult to learn Precalculus. It even makes you very frustrated. If you want to study Precalculus I recommend that you buy the The Complete Idiot's Guide to Precalculus or Precalculus with Limits (by Lial, Hornsby, and Schneider).