How to use ACOS function in excel
Inverse cosine excel
The ACOS function returns several inverse cosines of a number.
The returned angle is given in radians in the range 0 (zero) to pi.
This function is an inverse of COS and it only expects input from the range of 1 to 1. It gives a #NUM error when input is given outside the range of 1 to 1. The arccosine is the angle whose cosine is number.
Return value
Returns the arccosine, or inverse cosine, of a number.
Angle in radians.
Syntax
=ACOS(number)
Arguments:
The ACOS function syntax has the following arguments:
Number Required. The cosine of the angle you want and must be from 1 to 1.
It gives a #NUM error when input is given outside the range of 1 to 1. The arccosine is the angle whose cosine is number.
Note: If you want to convert the result from radians to degrees, multiply it by 180/PI() or use the DEGREES function
Examples
Formula  Description  Result 

=ACOS(0.9)  Arc cosine of 0.9 in radians, 2*pi/3  2.690565842 
=ACOS(0.5)*180/PI()  Arc cosine of 0.5 in degrees  120 
=ACOS(D5)  Arc cosine of D5 cell value in degrees  1.875488981 
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