Section 4.2 Definite Integral Math 1231: Single-Variable Calculus
Definite Integral: Definition
Net Area (Signed Area)
Existence of Definite Integral Theorem If f is continuous on [a, b], or if f has only a finite number of jump discontinuities, then f is integrable on [a, b]; that is, the definite integral exists.
Evaluate Integrals How to evaluate integrals? 1.Interpret the integrals in terms of areas. 2.Fundamental Theorem of Calculus. 3.Other techniques.
Examples Example Evaluate the following integral by interpreting it in term of (signed) areas. The integral is equal to the area of blue region, which is a quarter circle of radius 1.
Properties of the Integral
Examples Example
Evan and Odd Functions
More Examples