Grammar
ACOS(number)
Returns the arcsine, or inverse sine, of a number. The arcsine value is an angle, and the returned angle is given in radians.
Parameter
number
The sine of the angle you want.
The function supports only one number and returns illegal if more than one numbers are set.
The parameter must be between -1 and 1 (inclusive). The returned angle is between -pi/2 to pi/2 (inclusive). To express the returned angle in degrees, multiply the result by 180/PI().
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