I want to compute the following integral

The integrand has essential singularity at the origin, and 2-poles at ,which lie on the curve so i can't apply residue formula. How can i proceed?

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- Nov 28th 2012, 12:16 PMtenderlinecontour integral with singularities on the contour
I want to compute the following integral

The integrand has essential singularity at the origin, and 2-poles at ,which lie on the curve so i can't apply residue formula. How can i proceed? - Nov 28th 2012, 05:06 PMSworDRe: contour integral with singularities on the contour
Ive never seen integration where the singularities lie

*on*the contour, is that even defined? - Nov 28th 2012, 05:27 PMcoolgeRe: contour integral with singularities on the contour
You need to define the contour with small semi-circles around the poles of radius some \delta and then take the limit as \delta tends to zero. In that way the function will be analytic in the domain that has avoided the singularities. When f is analytic inside a domain D the integral over D of f = 0. Check any book on complex analysis. You can find the details.