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Euler's Machin-Like Formula

The Machin-Like Formula

\begin{displaymath}
{\textstyle{1\over 4}}\pi=\tan^{-1}({\textstyle{1\over 2}})+\tan^{-1}({\textstyle{1\over 3}}).
\end{displaymath}

The other 2-term Machin-Like Formulas are Hermann's Formula, Hutton's Formula, and Machin's Formula.

See also Inverse Tangent




© 1996-9 Eric W. Weisstein
1999-05-25