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Strassnitzky's Formula

The Machin-Like Formula

\begin{displaymath}
{\textstyle{1\over 4}}\pi=\cot^{-1}2+\cot^{-1}5+\cot^{-1}8.
\end{displaymath}

See also Machin's Formula, Machin-Like Formulas




© 1996-9 Eric W. Weisstein
1999-05-26