It just has to be repeated one more time that this book is unhelpful and useless.This book may have a wide variety of problems as some people said, I don't really have anything to compare it to in that sense.Mostly though it's like this. Math comes pretty easily to me and these calculus classes are no exception.I'm doing fine in my calculus class and I'm understanding the material.BUT. This book is useless.Every time I have a question the book has been useless. I mean, I come across something foreign or confusing and I page through the book like I'm used to doing, the problem came from the book after all. Pretty much every time though I come up blank and Google it.My teacher is alright at explaining calculus.The internet, turns out, is pretty great at it.This book however is totally useless at it.