Look he

http://support.microsoft.com/kb/78113

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Kind regards,

Niek Otten
Microsoft MVP - Excel

"Ad Pronk" wrote in message
...
Using Excel 2003 I "discover" a strange thing. Placing brackets around a
term
introduces an inaccuracy. Is this normal?
1-(1/cos(x)*cos(a.t+x) is nil for t=0 as it should be. But I use this term
in a series, so I have to place brackets around the term:
(1-(1/cos(x)*cos(a.t+x))
And surprisingly for t=0 I get the answer 1.1 E(-14).
It's small but I expect at least a value below E(-22) or 0

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Ad Pronk