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.
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:
Based on the Excel spreadsheet above, the following ACOS examples would return: