Wolfram Research
Wolfram Math World: Indefinite Integral
This MathWorld site offers an explanation of the indefinite integral. Includes links to related topics within the explanation.
Hofstra University
Hofstra University: The Indefinite Integral
Nice on-line tutorial site. The site explains the Anti derivative, gives formulas for finding the anti derivative of various general forms, and has examples the student can work on-line
Khan Academy
Khan Academy: Worked Example Motion Problems With Definite Integrals
Remember, anti derivative of acceleration with respect to time is velocity and anti derivative of velocity with respect to time is distance where acceleration, velocity, distance are all functions of t, the time. This concept is very...