I want to find Laurent series of function $\frac{z^2}{\cos^2z}$ in region $\frac{5\pi}{2}<|z|<\frac{7\pi}{2}$, but I do not know what to do.
2026-04-02 23:20:33.1775172033
Laurent Series of function $\frac{z^2}{\cos^2z}$
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