Fourier Integral for Cosine Function with Infinite Limits

In summary, the conversation discusses the need to find the integral of cos(wv) between -\infty and \infty for Fourier integrals. The output of this integral is sin(wv)/(pi*w) and the context and reasoning behind this result is unclear. It is suggested to write everything in terms of exponentials and to provide the entire problem for further understanding.
  • #1
kasse
384
1
Working with Fourier integrals, I need to find the integral

[tex]\int cos (wv) dv[/tex] between -[tex]\infty[/tex] and [tex]\infty[/tex]. Is it possible to find this integral?

What I get is sin(wv)/(pi*w) with the infinite limits for v.
 
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  • #2
Where did the pi come from? In the sense of a ordinary integral it makes no sense, it's divergent. In the sense of a Fourier integral it can make some sense, if you are also integrating over w. But I think you need to give us the complete context.
 
  • #3
If you are working with Fourier series, why are you integrating from negative infinity to infinity? The integral should be over one period.

If you are working with the Fourier transform, why are you integrating cosine? Write everything in terms of exponentials: cos(wv)= (ewv+ e-wv)/2.

As Dick said, please give us the entire problem.
 

1. What is the Fourier integral for a cosine function with infinite limits?

The Fourier integral for a cosine function with infinite limits is a mathematical representation of a continuous function as a sum of sinusoidal functions with different frequencies, amplitudes, and phases. It is used to analyze and decompose complex signals or functions into simpler components.

2. How is the Fourier integral for a cosine function with infinite limits calculated?

The Fourier integral for a cosine function with infinite limits is calculated by taking the function and multiplying it by a complex exponential function, then integrating over an infinite range. The resulting expression would be a summation of all the sinusoidal components of the original function.

3. What are the applications of the Fourier integral for a cosine function with infinite limits?

The Fourier integral for a cosine function with infinite limits has many applications in physics, engineering, and other fields. It is commonly used in signal processing, image processing, data compression, and solving differential equations. It is also used in analyzing vibrations, sound waves, and other periodic phenomena.

4. Can the Fourier integral for a cosine function with infinite limits be applied to any function?

Yes, the Fourier integral for a cosine function with infinite limits can be applied to any function as long as it meets certain requirements, such as being continuous and having a finite number of discontinuities.

5. What is the relationship between the Fourier integral and Fourier series?

The Fourier integral and Fourier series are closely related. The Fourier series is a special case of the Fourier integral, where the function is periodic and the integration is over a finite range. The Fourier series can be seen as a discrete version of the Fourier integral, where the frequencies and amplitudes are limited to a finite number of values.

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