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Introduction to integral calculus | Accumulation and Riemann sums | AP Calculus AB | Khan Academy - JJtheTutor
The basic idea of Integral calculus is finding the area under a curve. To find it exactly, we can divide the area into infinite rectangles of infinitely small width and sum their areasÑcalculus is great for working with infinite things! This idea is actually quite rich, and it's also tightly related to Differential calculus, as…