# What is a double integral meaning?

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Table of Contents

## What is a double integral meaning?

Double integrals are a way to integrate over a two-dimensional area. Among other things, they lets us compute the volume under a surface.

### Why do we use double integrals?

Double integrals are used to calculate the area of a region, the volume under a surface, and the average value of a function of two variables over a rectangular region.

What does the second integral tell us?

4 Answers. If a(t) is the acceleration at time t, then the first integral gives the velocity v(t), and the second integral gives the displacement s(t). That is the most important application, perhaps the only application, of integrating twice that you will meet this coming term.

What are the properties of double integrals?

The properties of double integrals are as follows:

• ∫x=ab ∫y=cd f(x,y)dy. dx = ∫y=cd∫x=ab f(x,y)dx. dy.
• ∫∫(f(x,y) ± g(x,y)) dA = ∫∫f(x,y)dA ± ∫∫g(x,y)dA.
• If f(x,y) < g(x,y), then ∫∫f(x,y)dA < ∫∫g(x,y)dA.
• k ∫∫f(x,y). dA = ∫∫k.f(x,y). dA.
• ∫∫R∪Sf(x,y). dA = ∫∫Rf(x,y). dA+∫∫sf(x,y). dA.

## How do you convert double integrals to polar coordinates?

Key Concepts

1. To apply a double integral to a situation with circular symmetry, it is often convenient to use a double integral in polar coordinates.
2. The area dA in polar coordinates becomes rdrdθ.
3. Use x=rcosθ,y=rsinθ, and dA=rdrdθ to convert an integral in rectangular coordinates to an integral in polar coordinates.

### Can double integrals be zero?

That double integral is telling you to sum up all the function values of x2−y2 over the unit circle. To get 0 here means that either the function does not exist in that region OR it’s perfectly symmetrical over it.

What is the difference between double and triple integrals?

A double integral is used for integrating over a two-dimensional region, while a triple integral is used for integrating over a three-dimensional region.

Who invented double integrals?

Introduction to the double integral. Created by Sal Khan.

## What do double integrals represent geometrically?

If f(x,y) is greater than or equal to 0 on a region R in the plane, then the double integral on R of f(x,y)dA can be interpreted geometrically as the volume of the solid under the surface z=f(x,y) and above R.

### What is the physical interpretation of double integral?

Just as the definite integral of a positive function of one variable represents the area of the region between the graph of the function and the x-axis, the double integral of a positive function of two variables represents the volume of the region between the surface defined by the function (on the three-dimensional …

What is double integration give an example?

The double integral is similar to the first way of computing Example 1, with the only difference being that the lower limit of x is 2y. The integral is ∬Dxy2dA=∫10(∫22yxy2dx)dy=∫10(x2y22|x=2x=2y)dy=∫10(2y2−(2y)2y22)dy=∫10(2y2−2y4)dy=2[y33−y55]10=2(13−15−(0−0))=2⋅215=415.

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