fourier summary

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Fourier Series, Integral and Transform Equations Summary Fourier Series : f ( x)= a 0 2 + n=1 ( a n ¿ cos nπx l + b n sin nπx l ) ¿ a n = 1 l c c+2 l F (x) cos nπx l dx b n = 1 l c c+2 l F ( x) sin nπx l dx HALF RANGE FOURIER SINE AND COSINE SERIES b n = 2 L 0 L f ( x ) sin nπx L dx a n =0 for half range sine series a n = 2 l 0 l F ( x) cos nπx l dx b n =0 for half range cosine series Euler coefficient a 0 = 1 2 π π π f ( x) dx a n = 1 π π π f (x) cos ( nx) dx bn= 1 π π π f ( x) sin( nx ) dx Periodic Functions: Even periodic function 1

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Fourier

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Fourier Series, Integral and Transform

Fourier Series, Integral and TransformEquations Summary Fourier Series :

HALF RANGE FOURIER SINE AND COSINE SERIES

for half range sine series for half range cosine series Euler coefficient

Periodic Functions:

Even periodic function

odd periodic function

Double Fourier series:

Parsivals Identity

Complex form of Fourier series:

where taking c = -L

Let has fundamental period . Let = . Then the complex Fourier series of is

Fourier Integrals

Equivalent Forms of Fourier Integral

If is odd

If is even

Fourier Transform

Fourier Sine and Cosine Transform

Fourier transform:

Convolution of and Fourier Sine and Cosine Transform

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