Returns the inverse cosine of a number. The inverse cosine is the Angle whose cosine is a number. The returned Angle value is expressed in radians and ranges from 0 to pi.
grammar
ACOS (number)
Number The cosine of the Angle, which must be between -1 and 1.
Instructions
If you want to express the inverse cosine value in DEGREES, multiply the result by 180/PI() or use the degrees function.
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