Not quite Pi, but something very closely related to Pi is retained to extremely high precision in computers. libm frequently contains 2/pi to very high precisi

Not quite Pi, but something very closely related to Pi is retained to extremely high precision in computers. libm frequently contains 2/pi to very high precision. For example, Newlib's math library contains 476 decimal digits of 2/pi as part of its routines for calculating sine and cosine of numbers outside the range [-pi/4..pi/4]. See e_rem_pio2.c for more. Many of the open source math libraries are ultimately descended from the same root: the Sunpro fdlibm, archived at netlib: http://www.netlib.org/fdlibm/ http://www.netlib.org/fdlibm/