How can i solve this Fourier Transform question?

aligator123
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How can i solve this Fourier Transform question?

Homework Statement



f(t)= a/((a^2)+(t^2)) if a>0 find the Fourier transform

Homework Equations



Just give me a hint to solve or first step for solving. Then i will solve.

The Attempt at a Solution



Thanks for help.
 
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Ok. Set up a contour integral and use the residue theorem.
 
ok but anyone can give more hints and details?
 
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