How To Use The ACOS Function In Excel

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The ACOS() Function Knowledgebase

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The inverse cosine function in Excel is written "ACOS".

The function accepts one argument between -1 and 1 and returns a value from -Pi/2 to Pi/2.
The function takes a ratio written in decimal notation and returns an angle in radians.
The Syntax for the funvtion is: ACOS(number)

How to use the ACOS() function I:

Note: p = 3.141...