在复数域上, 方程 $\sin z=z$

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怎么证明在复数域上, 方程 $\sin z=z$ 有无穷多解

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Great Picard's Theorem: If an analytic function f has an essential singularity at a point w, then on any punctured neighborhood of w, f(z) takes on all possible complex values, with at most a single exception, infinitely often.