The Fundamental Theorem of Calculus part 1 (part ii)

OK, so up to now we can't actually use the FTC (Fundamental Theorem of Calculus) to calculate any areas. That will come from the FTC part 2. For now, let's take some examples and see what the FTC is saying. I'll restate it here: The Fundamental Theorem of Calculus, part 1 If $latex f$ is continuous on $latex $ then