The Calculus Tutor covers all of the core topics in detail. What sets this series apart is that the concepts are taught entirely through step-by-step example problems of increasing difficulty. It works by introducing each new concept in an easy to understand way and using example problems that are worked out step-by-step and line-by-line to completion. Students will be able to work problems with ease, improve their problem-solving skills and understand the underlying concepts of Calculus. . This lesson begins with introducing the concept, a limit in Calculus. This concept of the limit is then used to present the formal mathematical definition of the derivative. This limit-based definition of the derivative is used to solve several problems that allow the student to gain practice in finding derivates of functions.