Question 7.35: Prove that cot z = 1/z + 2z{1/z² - π2 + 1/z² - 4π² + ···}.
Prove that \cot z=\frac{1}{z}+2 z\left\{\frac{1}{z^{2}-\pi^{2}}+\frac{1}{z^{2}-4 \pi^{2}}+\cdots\right\}.
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