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Fourier Series Expansion Calculator Online

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The Fourier Series Expansion Calculator is a powerful tool used in mathematics and engineering to decompose periodic functions into an infinite sum of sinusoidal functions. It essentially helps in representing complex periodic signals or functions as a combination of simpler trigonometric functions. This decomposition is incredibly useful in various fields, including signal processing, image processing, physics, and more.

Formula of Fourier Series Expansion Calculator

The Fourier Series Expansion Calculator operates based on the following mathematical formulas:

a_n = (2/T) * ∫[0 to T] f(x) * cos(2πnx/T) dx b_n = (2/T) * ∫[0 to T] f(x) * sin(2πnx/T) dx


  • a_n and b_n are the Fourier coefficients.
  • T is the period of the function.
  • n is the harmonic number.
  • f(x) is the periodic function.
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These formulas are integral to the Fourier series expansion process, where a_n and b_n coefficients are calculated to represent the amplitude and phase of each harmonic component of the original function.

Table of General Terms

Period (T)The duration of one cycle of the periodic function.
Harmonic Number (n)The integer representing the order of the harmonic component.
Fourier Coefficients (a_n, b_n)Amplitude and phase coefficients of the harmonic components.
Periodic Function (f(x))The function repeating its pattern over regular intervals.

This table provides a quick reference for users to understand the terms associated with the Fourier Series Calculator.

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Example of Fourier Series Expansion Calculator

Let's consider an example to demonstrate the application of the Fourier Series Expansion Calculator. Suppose we have a periodic function represented by the equation:

f(x) = x^2

And the period T = 2π. We want to find the Fourier coefficients for the first few harmonics (n = 1, 2, 3, ...).

After performing the calculations using the Fourier Series Expansion Calculator, we obtain the Fourier coefficients a_n and b_n for each harmonic, allowing us to accurately represent the original function as a sum of sinusoidal components.

Most Common FAQs

Q: How do I use the Fourier Series Calculator?

A: Simply input the period (T), harmonic number (n), and the periodic function (f(x)) into the calculator, then click on the "Calculate" button to obtain the Fourier coefficients (a_n, b_n) for the given function.

Q: Can the Fourier Series Calculator handle any periodic function?

A: Yes, the calculator can handle any periodic function, allowing you to accurately represent its Fourier series using the provided formulas.

Q: What if I encounter an error message while using the calculator?

A: If you encounter an error message, please ensure that you have entered valid inputs for the period, harmonic number, and function. If the issue persists, feel free to reach out for assistance.

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