Standard MC Calculator -> How does it get decimal accuracy for Sin/Cos?

[ThisIsMyUserName]

Unfortunatetly I'm at a location where I can't test a few things out but I've always wondered how the MS calculator will get a more accurate result of Sin/Cos vs using Sin(x) in C# and/or other languages.

The default Sin function returns a double type, so how does one get that extra accuracy if it only returns a double?

[VBAhack]

Hmmm, interesting question. Algorithms for high precision calculations have been around for years. For example, I have a DLL that can produce up to 200 significant digits for math calculations. With it I was able to duplicate the result for sin(0.785) as the MS calculator:

0.70682518110536592374613897300473

It does seen odd that the MS calculator has better precision than std Excel, which gives:

0.706825181105366

Don't know.