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In Excel, the ACos function returns the arccosine (in radians) of a number.

The syntax for the ACos function is:

ACos( number )

number is a number between -1 and 1. It is the cosine of the angle that you wish to find.

Applies To:

  • Excel 2007, Excel 2003, Excel XP, Excel 2000
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Q: How does the trig function ACOS work in Excel?
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