Math and Trignometric - ACOS Function
Description
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)
Arguments
Argument | Description | Required/Optional |
---|---|---|
Number | The cosine of the angle you want and must be from -1 to 1. | Required |
Notes
If you want the angle returned by the ACOS Function to be expressed in degrees, you can convert it,
using the Excel Degrees Function =DEGREES (radians)
or, by multiplying it by 180/PI()
If the specified number is outside the range -1 to +1, ACOS returns #NUM! error.
If the specified number is not recognized as a numeric value, ACOS returns #VALUE! Error.
Applicability
Excel 2007, Excel 2010, Excel 2013, Excel 2016