Home » Courses » Mathematics » Single Variable Calculus » 3. The Definite Integral and its Applications » Part A: Definition of the Definite Integral and First Fundamental » Session 44: Adding Areas of Rectangles

By dividing a region up into thinner and thinner rectangles, we can describe its area as a limit of sums of rectangle areas. Even when using summation notation, this process can be time consuming.
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