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 in the range 0 (zero) to pi.

ACOS takes 1 required argument and no optional arguments:

Syntax: ACOS(number)

#1)
Using the ACOS function:
#2)
The arguments for the ACOS function are:
Argument Required? Description
number Required The cosine of the angle you want and must be from -1 to 1.

Summary

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 in the range 0 (zero) to pi.
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