Arbitrary precision (big number) library port for Arduino

Using Arduino Programming Questions
61

On the continuing quest for speed, the new and improved cos :-

BigNumber cose (const BigNumber x, BigNumber precision)
{
  const BigNumber pidiv2
    ("1.5707963267948966192313216916397514420985846996875529104874722961539082031431");
  return (sine((x+pidiv2) , precision ));
} // end of function cose

Cheers, G