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Description: 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.
Syntax: ACOS(Number)
Number is the cosine of the angle you want and must be from -1 to 1.
Remarks:
If you want to convert the result from radians to degrees, multiply it by 180/PI or use the DEGREES function.
Example:
ACOS(-0.5) = 2.094395 [the arccosine of -0.5 in radians]
ACOS(-0.5)*180/PI() = 120 [the arccosine of -0.5 in degrees]
DEGREES(ACOS(-0.5)) = 120 [the arccosine of -0.5 in degrees]
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