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JavaScript Math acos Function | Math.acos() In Javascript

Javascript Math acos() is an inbuilt function that is used to find the arccosine value of a given argument. Javascript Math.acos() function is used to return the arccosine of a number in radians. JS Math.acos() method returns the numeric value between 0 and pi radians.

JavaScript Math acos

If you want to find the arccosine value of a given argument in JavaScript, then you can use the Math.acos() method. The acos() method comes handy in programming contexts dealing with any trigonometric expressions. The acos() is a static method of Math, and it can be used without creating an object.

Math.acos(x)

Parameter(s)

The variable x lying between -1 and 1 whose arccosine value is to be determined.

Return Value

The arccosine value between 0 and pi radians.

See the following figure.

Note:

• If the passed value lies outside the range [-1,1], the method returns NaN.

Compatibility

• Internet Explorer
• Firefox
• Opera
• Safari
• Android webview
• Chrome for Android
• Firefox for Android
• Opera for Android
• Safari on iOS
• Samsung Internet
• Node.js

JavaScript version: ECMAScript 1

Consider the following examples.

JavaScript Math acos() Code Example

The following example demonstrates the use of the Javascript Math acos() method.

// example1.js

var a = -1;
var b = 1;
var c = 0.5;
var d = 0;

console.log(Math.acos(a));
console.log(Math.acos(b));
console.log(Math.acos(c));
console.log(Math.acos(d));

Output

node example1
3.141592653589793
0
1.0471975511965979
1.5707963267948966

Example 2

The following example demonstrates the case where values outside the range of [-1,1] are passed as parameters.

// example2.js

var a = 2;
var b = -2;

console.log(Math.acos(a));
console.log(Math.acos(b));

node example2
NaN
NaN

Example 3

The following example demonstrates an application of this method in a simple programming context.

Given the three sides of a right-angled triangle, find all of its angles.

// example3.js

var h;
var b;
var p;

const rl = r.createInterface({
input: process.stdin,
output: process.stdout
});

const prompt1 = () => {
return new Promise((resolve, reject) => {
resolve();
});
});
};

const prompt2 = () => {
return new Promise((resolve, reject) => {
resolve();
});
});
};

const prompt3 = () => {
return new Promise((resolve, reject) => {
resolve();
});
});
};

const main = async () => {
await prompt1();
await prompt2();
await prompt3();
rl.close();

console.log('The three angles of the triangle are(in radians):');
console.log(Math.acos(b / h)); 			//base angle
console.log(Math.acos(0) - Math.acos(b / h)); 	//third angle
}

main();

Output

Test Case 1:
->node example3
Hypotenuse: 6.928
Base: 6
Perpendicular: 3.464
The three angles of the triangle are:
1.5707963267948966
0.523547964303085
1.0472483624918114

Test Case2:
->node example3
Hypotenuse: 42.426
Base: 30
Perpendicular: 30
The three angles of the triangle are(in radians):
1.5707963267948966
0.7853885732135081
0.7854077535813885

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