# 6 Definite Integrals

In this chapter, we use the problem of calculating the area of a region to introduce the concept of the definite integral. Although in the beginning, the definite integral seems very different from the indefinite integral, introduced in the previous chapter, the Fundamental Theorem of Calculus reveals a deep connection between them. In this chapter, we apply the definite integral to find the net change of a variable and study the rectilinear motion, and to find the average value of a function. Some other applications of the definite integral will be discussed in the next chapter.

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