The Javascript Math.acos( ) method is used to return the arccosine of a number in radians. The Math.acos() method returns a numeric value between 0 and pi radians. The Math acos() is a static method of Math, therefore, it is always used as Math.acos(), rather than as a method of a Math object created.
Math.acos(x)=arccos(x)=unique y, where y belongs to [0;pi] such that cos(y)=x
Syntax:
Math.acos(value)
Parameters: This function accepts a single parameter as mentioned above and described below:
- Value: It is a number in radians whose arccosine you want to find.
Return value: The Math.acos() function returns the arccosine of the given number in radians.
The below examples illustrate the Math acos( ) method in JavaScript:
Example 1: When 1 is passed as a parameter.
console.log("When 1 is passed as a parameter: "
+ Math.acos(1));
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Output:
When 1 is passed as a parameter: 0
Example 2: When -1 is passed as a parameter.
console.log("When -1 is passed as a parameter: "
+ Math.acos(-1));
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Output:
When 1 is passed as a parameter: 3.141592653589793
Example 3: When 0 is passed as a parameter.
console.log("When 0 is passed as a parameter: "
+ Math.acos(0));
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Output:
When 0 is passed as a parameter: 1.5707963267948966
Example 4: When 0.5 is passed as a parameter.
console.log("When 0.5 is passed as a parameter: "
+ Math.acos(0.5));
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Output:
When 0.5 is passed as a parameter: 1.0471975511965979
Example 5: When 2 is passed as a parameter.
console.log("When 2 is passed as a parameter: "
+ Math.acos(2));
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Output:
When 2 is passed as a parameter: NaN
We have a complete list of Javascript Math Objects methods, to check those please go through this Javascript Math Object Complete reference article.
Supported Browsers:
- Google Chrome 1 and above
- Internet Explorer 3 and above
- Firefox 1 and above
- Opera 3 and above
- Safari 1 and above