Recall from Section 14.3 that a function g is called harmonic on D if it satisfies Laplaces
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Recall from Section 14.3 that a function g is called harmonic on D if it satisfies Laplace’s equation, that is, ∇2g = 0 on D. Use Green’s first identity (with the same hypotheses as in Exercise 33) to show that if g is harmonic on D, then ∮CDngds = 0. Here Dng is the normal derivative of t defined in Exercise 33.
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