Lemma 8 — $\lim_{r\to0^+}\int_{C_r(z_0,\theta_1,\theta_2)}f(z)\,dz=-i(\theta_2-\theta_1)c$

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Lemma 8 — $\lim_{r\to0^+}\int_{C_r(z_0,\theta_1,\theta_2)}f(z)\,dz=-i(\theta_2-\theta_1)c$ · Prove2Me