May 2001
Intermediate to advanced
720 pages
23h 24m
English
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Name
Math.acos( ) Method — compute the arc cosine of a number
Availability
Flash 5; may be used when exporting Flash 4 movies
Synopsis
Math.acos(x)
Arguments
- x
A number between -1.0 and 1.0 (the cosine of an angle).
Returns
The angle, in radians, whose cosine is x.
If x is not in the range -1.0 to 1.0,
returns NaN.
Description
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 to π (i.e., to 3.14159...).
Example
trace (Math.acos(1.0)); // Displays: 0 trace (Math.acos(0.0)); // Displays: 1.5707... (i.e., pi/2)
See Also
Math.asin( ), Math.atan( ),
Math.cos( )
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