Learn about double integrals in multivariable calculus with Khan Academy's comprehensive guide.

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Double integrals do more than find volume under three-dimensional graphs. Here we cover other uses, a more general notation for double integrals, and explain the "feel" of double integration.

If the upper bound of one definite integral is the same as the lower bound of another, we can simply consolidate them into one integral like Sal did. If we eyeball the graph, it looks like the area from -4 to -2 is about -3.5, and it looks the same for the area from -2 to 0.

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