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.



Number     is the cosine of the angle you want and must be from -1 to 1.


If you want to convert the result from radians to degrees, multiply it by 180/PI() or use the DEGREES function.



Description (Result)


Arccosine of -0.5 in radians, 2*pi/3 (2.094395)


Arccosine of -0.5 in degrees (120)


Arccosine of -0.5 in degrees (120)

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