Math.acos() method returns the arc-cosine of the given number.
|x||Required||Specifies a number.|
|Number||The arc-cosine of the given number.|
The return value will be between 0 and π, if the given value is between -1 and 1.
The return value is represented in radians.
|NaN||If the given value is not between -1 and 1.|
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