5. Prove Corollary 5.3.4 directly from Theorem 4.3.3. Do not appeal to the residue theorem.
6. Let Ω⊆C be open such that−z∈Ω wheneverz∈Ω. Supposefis even and analytic on Ω except for isolated singularities in Ω. Prove that ifa∈Ω is a pole of orderm∈N or an essential singularity off, then−ais a singularity of the same type and
Resf(z) =−Resf(z).
z=−a
z=a
γ
f(z)dz= 0?
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