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# Applications of the Definite Integrals - PowerPoint PPT Presentation

Applications of the Definite Integrals. Dr. Faud Almuhannadi Math 119 - Section(4). Done by:. Hanen Marwa Najla Noof Wala. In this part, we are going to explain the different types of applications related to the “ Definite Integrals “. Which includes talking about :

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### Applications of the Definite Integrals

Math 119 - Section(4)

• Hanen

• Marwa

• Najla

• Noof

• Wala

different types of applications related to the “ Definite Integrals “.

• Area under a curve

• Area between two curves

• Volume of Revolution

In calculus, the integral of a function extends the concept of an ordinary sum. While an ordinary sum is taken over a discrete set of values, integration extends this concept to sums over continuousdomains

The simplest case, the integral of a real-valued function f of one real variable x on the interval [a, b], is denoted:

The function ∫ sign represents integration; aandb are the lower limit and upper limit of integration, defining the domain of integration; f(x) is the integrand; and dx is a notation for the variable of integration

Computing integrals function

The most basic technique for computing integrals of one real variable is based on the fundamental theorem of calculus. It proceeds like this:

• Choose a function function f(x) and an interval [a, b].

• Find an antiderivative of f, that is, a function F such that F' = f.

• By the fundamental theorem of calculus, provided the integrand and integral have no singularities on the path of integration,

• Therefore the value of the integral is F(b) − F(a).

Case ..1.. function

Area Under a Curve

Example ..1.. function

The graph below shows the curve

and is shaded in the region

Example ..2.. function

Case ..2.. function

Area between two curves

Superimposing the two graphs: function

Area bounded by f(x) and g(x)

Example ..3.. function

•  Find the area between the curves

y = 0      and      y = 3(x3 - x)

Example ..4.. function

• Find the area bounded by the curves

y = x2 - 4x – 5

and

y = x + 1

Rotation about y-axis: part of a curve is rotated about a straight line.

Example ..5.. part of a curve is rotated about a straight line.

• The volume that we are looking for is shown in the diagram below

Thank u 4 listening part of a curve is rotated about a straight line.