$$u(x,y)=\sum_{n=1}^{\infty}\dfrac{-2 \cos n \pi}{n \pi}\dfrac{\sinh n \pi(y-1)}{\sinh(-n \pi)}\sin (n \pi x)$$
I tried putting random values of $x$ and $y$ and simplified. But still stuck on it. How can I solve this?
2026-03-27 05:05:51.1774587951
How to find infinite sum of trigonometric, hyperbolic function?
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