Harmonic function, line integral and greens theorem

dopplereffekt1

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Joined
Apr 9, 2020
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1
Hello.
Photo of my problem is attached.
Thoughts and questions:
My understanding is that I should use greens theorem here to somehow manipulate it into the line integral shown on the photo. But I’m having trouble getting started and was wondering if anyone could give me some hints to get the ball rolling.D2DE43B0-8C80-4FBC-8B78-68CE0A8B19FB.jpeg

thanks
 
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