Integrals
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Overview
Definition of an integral
Evaluating integrals using anti-derivatives
The fundamental theorem of calculus
Definition of an integral
The integral is denoted by the symbol β« and has two limits of integration (the lower and upper limits).
Evaluating integrals using anti-derivatives
Antiderivatives (or indefinite integrals) are used to evaluate integrals.
The antiderivative of a function f(x) is a function F(x) such that F'(x) = f(x). If F(x) is an antiderivative of f(x), then we can find the definite integral of f(x) over the interval [a, b] using the following formula:
The fundamental theorem of calculus
The fundamental theorem of calculus establishes the relationship between differentiation and integration. It states that if f(x) is a continuous function on the interval [a, b], and F(x) is an antiderivative of f(x), then: