Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Not very thorough

This book is anything but a comprehensive guide. The author fails to go into verbose detail on almost every problem, leaving you guessing how she came to that conclusion. That would be fine if this was an advanced trig book, but it's the DUMMIES guide and as such I'd expect to be taken through every step of every problem. There's plenty of room for this; there are huge margins which could have been used to fill in more detail.It also completely fails to explain trig identities in a sensible way, which if you're a student struggling with challenging trig identity problems, this book won't be of any help.