ACOS Function Explained
The ACOS function in Microsoft Excel returns the arccosine, or inverse cosine, of a number. It takes a single argument, a number between -1 and 1, and returns the arccosine of that number in radians. The result is between 0 and pi.
ACOS Function Syntax
ACOS(number)
- number: The angle in radians for which you want the cosine.