content: If you read it through and through, you will find how wonderful it is to approach calculus in a graphical, numerical and symbolic way. If you want to challenge your mind in this way, this book is probably the most suitable for you. I am using it in my calculus calss, and I found the concepts are very clearly explained. The thing that I love most of this book is that it helps students develop a good understanding of calculus through observing and studying the graphs of the functions. This only imperfection of the book, if any, is that there lack of some theoretical exercises. But any book can not be perfect. The most important thing is how you enjoy it. For me, it is a new and fresh guide of the study of calculus.