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Gauss's Machin-Like Formula

The Machin-Like Formula

\begin{displaymath}
{\textstyle{1\over 4}}\pi = 12\cot^{-1}18+8\cot^{-1}57-5\cot^{-1}239.
\end{displaymath}




© 1996-9 Eric W. Weisstein
1999-05-25