Problem with a contour integral

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SUMMARY

The discussion focuses on solving the contour integral from 0 to infinity of the function (x^2 Sin[xr]) / ((x^2 + m^2)x r) using complex analysis techniques. The user initially considered a contour in the upper half-plane and divided it into four paths. They successfully identified the residue at (im) as the only contributing factor to the integral, confirming that the approach is valid. The conclusion emphasizes the importance of residue theory in evaluating contour integrals.

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orion141
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I was w=kind of confused as of how to go about solving this integeal using complex methods. it is the Integral from 0 to infinity of{dx((x^2)(Sin[xr])}/[((x^2)+(m^2))x*r] where m and r are real variables. I tried to choose a half "donut" in the upper part of the plane with radii or p and R. Then I tried to break up the contour integral into paths 1, 2, 3, 4. is this the correct way to go about this? Thanks
 
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I think that i figured it out... I found the residue at (im) as this is the only residue that contributes to the integral (-im is not in the contour and R(0)=0). Does this sound right? Thanks
 

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