I was wondering if anyone knew a way to find the value of d for the following converging infinite sum:
$$ \sum_{n=2 }^{\infty}\arccos \left ( -\frac{d^{n+1}+d^{2n}+d^n-d}{(d^{n-1}-1)(d^n-d)} \right ) = \pi $$
Thanks!
2026-03-25 20:36:20.1774470980
Infinite Sum of a Converging Series of Inverse Cosines
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