Definite integrals (part II)

Learn more: http://www.khanacademy.org/video?v=6PaFm_Je5A0
More on why the antiderivative and the area under a curve are essentially the same thing.

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Definite Integrals (area under a curve) (part III)

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Definite Integrals (part 4)

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Definite Integrals (part 5)