The ACOS function returns the arccosine, or inverse cosine, of a number. The arccosine is the angle whose cosine is number. The returned angle is given in radians between 0 and π.
Syntax: =ACOS(number)
The ACOS function syntax has the following arguments:
- number: A number between -1 and 1. It is the cosine of the angle that you wish to find.
Example: Let’s look at some Excel ACOS function examples and explore how to use the ACOS function as a worksheet function in Microsoft Excel:
Syntax: =ACOS(C2)
Result:
Based on the Excel spreadsheet above, the following ACOS examples would return:
Syntax: =ACOS(C3)
Result: 2.094395102
Syntax: =ACOS(C4)
Result: 2.278380764
Syntax: =ACOS(C5)
Result: 1.570796327
Syntax: =ACOS(C6)
Result: 0.86321189
Syntax: =ACOS(C7)
Result: 1.047197551
Syntax: =ACOS(C8)
Result: 0
