ACOS

Returns the inverse cosine ( a rccosine) of a number. The output is a value in radians between 0 and pi.

Syntax

ACOS(number)

number: The (cosine) value whose inverse cosine you want to calculate. It must be between -1 and 1, inclusive. Eg., -0.9

Remarks

To return the angle in degrees, use the DEGREES function or multiply it by 180/PI().

Examples

Formula	Result
=ACOS(0.3)	1.266103673
=ACOS(-0.9)	2.690565842
=ACOS(1/2)	1.047197551

Get a hands-on experience of the function in the embedded range below.

Possible errors

Errors	Meaning
#N/A!	The function could not find the value it was asked to look for. Commonly occurs in VLOOKUP and similar functions.
#NAME!	The function name is incorrect or invalid. The given defined name (if any) is invalid. There is a typo in the defined name used in the function. Double quotes are missing for text values in the function. Colon missing in a cell range reference.
#VALUE!	The given argument's data type is incorrect or invalid. For example, the function =DATE(A1:A3) will return a #VALUE error when a text value is present in the range.
#REF!	The given cell reference is incorrect or invalid. This error may occur when a cell/range has been deleted, moved, or pasted over.
#NUM!	The given input number is not between -1 and 1.

Similar functions

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