Machin's formula is given by
There are a whole class of Machin-like formulas with various numbers of terms (although only four such formulas with only two terms). The properties of these formulas are intimately connected with cotangent identities.
Machin's formula is given by
There are a whole class of Machin-like formulas with various numbers of terms (although only four such formulas with only two terms). The properties of these formulas are intimately connected with cotangent identities.
Weisstein, Eric W. "Machin's Formula." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/MachinsFormula.html