The ACOS function returns the arccosine (inverse cosine) of the given number. Arccosine is nothing but an angle and its cosine value is a number. Note: The returned angle is given in the range 0 to pi (in radians).
=ACOS(Number) Whereas "Number" is the value whose arccosine has to be found. It should be from -1 to 1.
Let us find the arccosine value of the given number, using the ACOS function, with the help of the below video.