## Definite Integral

### The definite integral is a mathematical operation that represents the calculation of the signed (positive or negative) area under a curve in a specific interval

The definite integral is a mathematical operation that represents the calculation of the signed (positive or negative) area under a curve in a specific interval. It is typically denoted by the symbol ∫, with the integral sign, the function to be integrated, and the interval within square brackets. For example:

∫[a, b] f(x) dx

Here, f(x) is the function being integrated, and [a, b] represents the interval over which the integration is performed. The variable dx indicates that the integral is with respect to x.

The definite integral is used to find various quantities, such as the area between a curve and the x-axis, the displacement of an object over a given time interval, or the total accumulated value of a certain quantity. It provides a way to measure the net change of a function over a specific interval.

To compute the definite integral, one typically follows the fundamental theorem of calculus, which states that if F(x) is an antiderivative of f(x), then:

∫[a, b] f(x) dx = F(b) – F(a)

This means that evaluating the definite integral is equivalent to subtracting the values of the antiderivative at the upper limit of integration (b) from the lower limit of integration (a).

There are different methods to calculate definite integrals, including basic techniques like the power rule, integration by substitution, and integration by parts, as well as more advanced methods like numerical approximation techniques such as the trapezoidal rule or Simpson’s rule.

Overall, the definite integral plays a significant role in calculus, providing a fundamental tool for solving problems involving area, accumulation, and change in various fields such as physics, engineering, economics, and more.

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