ESSENTIAL
CALCULUS

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Chapter 1: Functions and Limits

Visual Calculus / Pre-Calculus
An excellent site that has tutorials covering virtually everything about functions. It also has interactive online applets, practice problems with solutions, examples, quizzes, and tutorials on using graphing calculators.

Section 1.1: Functions and Their Representations

Four ways to represent a function
This site contains flash animated discussions of the meaning of the word function under the four standard representations.

Section 1.2: A Catalog of Essential Functions

Composite Functions
This is a thorough explanation of the concept of composite functions and their domains, along with a couple of worked out examples.

Section 1.5: Continuity

Continuity and Discontinuity
Definitions and examples of continuity and discontinuity both at single points and on intervals.

Section 1.6: Limits Involving Infinity

Limits of Functions as x Approaches Infinity
Practice questions provided by UC Davis, with solutions.