ACOS()
Syntax. ACOS(number)
Definition. The arccosine is the angle whose cosine is number.
Arguments
number (required) The cosine of the angle; must be between –1 and 1
Background. Use the ACOS() function to calculate the adjacent angle based on the cosine (see Figure 16-2). The result is a radian measure and has to be converted into degrees with the DEGREES() function. Because each angle occurs two times in a full circle, the value range for an arccosine is restricted:
If the angle is calculated as a radian measure, the value range spans 0 to π (pi).
If the angle is calculated in degrees, the value range spans 0 to 180 degrees.
The arccosine is strictly monotonic decreasing. The values of the arccosine in a coordinate plane create the graph shown in ...
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