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Hermann's Formula

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The Machin-like formula

1/4pi=2cot^(-1)(2)-cot^(-1)(7).

The other 2-term Machin-like formulas are Euler's Machin-like formula, Hutton's formula, and Machin's formula.

See also

Euler's Machin-Like Formula, Hutton's Formula, Machin's Formula, Machin-Like Formulas

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Cite this as:

Weisstein, Eric W. "Hermann's Formula." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HermannsFormula.html

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