Problem 1721 (difficulty: 5/10)

a) \(\displaystyle \displaystyle \int\limits_{C(\pi, 1)} \frac z {\sin z} dz=?\)    b) \(\displaystyle \displaystyle \int\limits_{C(\pi i, 1)} \frac {e^z}{(z-\pi i)^2} dz=?\)

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