| Math.acos( ) Method | Flash 5; can be used when exporting Flash 4 movies |
| compute the arc cosine of a number |
A number between -1.0 and 1.0 (the cosine of an angle).
The angle, in radians, whose cosine is x. If x is not in the range -1.0 to 1.0, returns NaN.
The arc cosine function (sometimes written as
cos-1) is the inverse of the cosine
function. It returns the angle whose cosine has the specified value,
in radians. The return value is in the range of 0 to 
(i.e., 0 to 3.14159).
trace (Math.acos(1.0)); // Displays: 0 trace (Math.acos(0.0)); // Displays: 1.5707... (i.e., pi/2)
Math.asin( ), Math.atan( ), Math.cos( )