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

Example

advanced_excel_math_trigonometric_functions.htm