- #1
matematikuvol
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Homework Statement
Find Fourier transform of function
[tex]f(x)=\frac{1}{x^2+a^2}[/tex], [tex]a>0[/tex]
Homework Equations
[tex]\mathcal{F}[\frac{1}{x^2+a^2}]=\frac{1}{\sqrt{2\pi}}\int^{\infty}_{-\infty}\frac{e^{-ikx}dx}{x^2+a^2}[/tex]
The Attempt at a Solution
Two different case
[tex]k>0[/tex]
and
[tex]k<0[/tex]
How to solve integral
[tex]\mathcal{F}[\frac{1}{x^2+a^2}]=\frac{1}{\sqrt{2\pi}}\int^{\infty}_{-\infty}\frac{e^{-ikx}dx}{x^2+a^2}[/tex]
Probably using complex analysis?! I forget this. I have two poles [tex]ia[/tex] and [tex]-ia[/tex]. How to integrate this? Is there some other method without using complex analysis?