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ACOS
This function calculates the arccosine, that is, the angle whose cosine is the specified value.
Syntax
ACOS(value)
Arguments
[Required] Specifies the cosine of the angle you want to return, which must be a value between –1 and 1.
Remarks
The result angle is in radians between 0 (zero) and PI (pi). If you want to convert the result to degrees, multiply the result by 180/PI.
Examples
ACOS(B3)
ACOS(R3C2)
ACOS(0.5) gives the result 1.0471975512