Eric Thoma

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Proving $\sum\limits_{l=1}^n \sum\limits _{k=1}^{n-1}\tan \frac {lk\pi }{2n+1}\tan \frac {l(k+1)\pi }{2n+1}=0$

sequences-and-series trigonometry

jul 22 at 12:42 robjohn♦ 59.4k

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