My Math Forum Contour line integral question

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 February 25th, 2018, 08:49 AM #1 Member   Joined: Jan 2016 From: Blackpool Posts: 95 Thanks: 2 Contour line integral question By rewriting the integral as a contour integral around the unit circle C(0, 1) show that $\int_{0}^{2\pi}\frac{1}{2+isin(\theta)}d\theta=2pi/\sqrt{5}$ Last edited by Jaket1; February 25th, 2018 at 08:52 AM.
 April 25th, 2018, 03:49 AM #2 Math Team   Joined: Jan 2015 From: Alabama Posts: 3,198 Thanks: 872 That function is $\displaystyle \frac{1}{2+ isin(z)$ restricted to the unit circle. Since this is a closed contour, the integral is equal to the sum of its residues inside the unit circle. Where does the function have poles?

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