How to calculate the area under a broken curve

Definite integral of piecewise function | AP Calculus AB | Khan Academy · 6:13 · Video: Khan Academy · Watch at the source

In short: When a function changes its behavior at a specific point, finding its total area requires a strategic split. This video demonstrates how to evaluate definite integrals for piecewise functions by breaking the problem into manageable parts.

The video features Sal evaluating a definite integral over an interval that spans multiple cases of a piecewise function. Because piecewise functions are defined by different rules over different sub-intervals, the total integral is found by summing the integrals of each individual piece.

This concept is a core component of the AP Calculus AB curriculum. The lesson is presented by the Khan Academy team, which includes Bill Scott, a teacher at Phillips Academy in Andover, Massachusetts, who helped develop the platform's AP calculus materials.

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