Machin's Formula

Author

Eric W. Weisstein
October 13, 2004

This notebook downloaded from http://mathworld.wolfram.com/notebooks/SpecialFunctions/MachinsFormula.nb.

For more information, see Eric's MathWorld entry http://mathworld.wolfram.com/MachinsFormula.html.

©2005 Wolfram Research, Inc. except for portions noted otherwise

Identity

FunctionExpand[4ArcTan[1/5]-ArcTan[1/239]]