Machin's Formula
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.
See also
196-Algorithm
,
Gregory Number
,
Machin-Like Formulas
,
Pi
© 1996-9
Eric W. Weisstein
1999-05-26