Hi,

1. Computers work in binary is part of the explanation.
2. The algorithm used doesn't address 0 specifically, which may have been
corrected in 2010.
3. You can always apply ROUND(COS(RADIAN(A1)),10)

--
If this helps, please click the Yes button.

Cheers,
Shane Devenshire


"mikelee101" wrote:

Hello All,
I was just curious why I wasn't getting zero for the result of the cosine of
a 90 degree angle. This formula

=COS(RADIANS(90))

returns

6.12574E-17

when I would have expected 0. Am I misusing a function in there somewhere?
Any thoughts would be greatly appreciated.

Excel 07, XPPro SP3.

Thanks.
--
Mike Lee
McKinney,TX USA