Hi Eric,

COS expects radian, not degrees.
=COS(RADIANS(45)) yields 0.707106781

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Kind regards,

Niek Otten
Microsoft MVP - Excel


"Eric" wrote in message ...
| Does anyone have any suggestions how to use Cos function in Excel?
| When I type =cos(45) in cell A1, it returns 0.525322 which is not 1/Sqrt(2).
| Does anyone have any suggestions on how to use Cos?
| Thanks in advance for any suggestions
| Eric