Wednesday, April 11, 2018

complex analysis - Evaluate the Cauchy Principal Value of intinftyinftyfracsinxx(x22x+2)dx

Evaluate the Cauchy Principal Value of sinxx(x22x+2)dx




so far, i have deduced that there are poles at z=0 and z=1+i if using the upper half plane. I am considering the contour integral Ceizz(z22z+2)dz I dont know how to input graphs here but it would be intended at the origin with a bigger R, semi-circle surrounding that. So, I have four contour segments.



CR+rR+Cr+Rr=2πiRes[f(z)eiz,1+i]+πiRes[f(z)eiz,o] I think. Ok, so here is where I get stuck. Im not sure how to calculate the residue here, its not a higher pole, so not using second derivatives, not Laurent series. Which method do I use here?

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