# Integration – Integration By Parts

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211 Integral calculus aids in the discovery of a function’s antiderivatives. These anti-derivatives are also known as function integrals. Integration refers to the process of determining a function’s anti-derivative. Finding integrals is the inverse process of finding derivatives. A function’s integral represents a family of curves. Integration by parts can be used to integrate the multiplication of two or more functions ∫f(x).g(x). The fundamental calculus consists of finding both derivatives and integrals. In this topic, we will go over the fundamentals of integrals as well as how to evaluate integrals and we will learn about integration by parts method.

## What are Integrals?

In mathematics, an integral is either a numerical value equal to the area under a function’s graph for some interval (definite integral) or a new function whose derivative is the original function (indefinite integral). The fact that the indefinite integral can be used to find the definite integral of any function that can be integrated connects these two meanings.The definite integral of a function f(x) is denoted as

and equals the area of the region bounded by the curve y = f(x), the x-axis, and the lines x = a and x = b .

## Properties of Integral Calculus

Let us investigate the properties of indefinite integrals in order to work with them.

• The integrand is the derivative of an integral. f(x) +C = f(x) dx
• Two indefinite integrals with the same derivative produce the same family of curves and thus are equivalent. [ –  ] = 0
• The sum or difference of the integrals of a finite number of functions equals the sum or difference of the integrals of the individual functions. +  =  +
• Outside of the integral sign, the constant is taken, k f(x) dx = k f(x) dx, where k R = k f(x) dx

## Types of Integrals

Integrals are classified into two types: Definite and Indefinite. A Definite Integral is an integral with definite limits, i.e., upper and lower limits. It is also referred to as the Riemann Integral. It is written as follows:

Indefinite Integral is defined as an integral with undefined upper and lower bounds.

The indefinite integral is defined as f(x)d(x)=F(x)+C, where C is the constant value.

## When Do We Use Integration By Parts?

When the simple process of integration is not possible, the integration by parts is used. We can use the integration between parts formulas if there are two functions and a product between them. We can also use integration by parts to find the integrals for a single function by using 1 as the other functions.

Formula for integration by parts –

∫f(x) g(x).dx = f(x).∫g(x).dx–∫(f′(x).∫g(x).dx).dx

## Applications of Integrals

There are numerous applications for integrals, some of which are listed below:

• To locate the center of mass (Centroid) of a curved-sided area in mathematics
• calculating the area between two curves
• calculating the area under a curve
• A curve’s average value

In Physics

Integrals are used in mathematics to calculate

• gravitational center
• Vehicle mass and momentum of inertia
• Satellite mass and momentum
• A tower’s mass and momentum
• The center of gravity
• The velocity of a satellite when it is placed in orbit.
• The trajectory of a satellite at the time it is launched into orbit.
• To compute Thrust

Integrals can also be used to calculate the area enclosed by the eclipse, the area of the region bounded by the curve, or any enclosed area bounded by the x and y axes. The use of integrations varies according to the field. It is used by graphic designers to create three-dimensional models. It is used by physicists to determine the center of gravity, among other things. If you want to learn more about exponents in a fun and exciting way you can visit the Cuemath website.

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