JavaScript acos – Find Arccosine and Inverse Cosine of Number

To find the arccosine, or inverse cosine, of a number, we can use the JavaScript acos() function from the math module.

Math.acos(x)

In JavaScript, we can easily use trigonometric functions with the JavaScript math module. The JavaScript math module allows us to perform trigonometry easily.

With the JavaScript math module, we can find the arccosine of a number easily.

To find the arccosine of a number, we use the math acos() function.

Below is the JavaScript syntax to find the inverse cosine of a number.

Math.acos(x)

The input to the acos() function must be a numeric value between -1 and 1. The return value will be a numeric value between 0 and pi radians.

console.log(Math.acos(0.5))
console.log(Math.acos(0))
console.log(Math.acos(-0.75))

#Output: 
1.0471975511965979
1.5707963267948966
2.4188584057763776

Finding the Inverse Cosine of a Number in JavaScript

Arccosine is defined as the inverse of the cosine of a number.

Below, we show that if we pass a number to cos() and then call the JavaScript acos() function, we get back the same number.

console.log(Math.acos(math.cos(math.PI/3)))
console.log(Math.PI/3)

#Output: 
1.0471975511965976
1.0471975511965976

Hopefully this article has been beneficial for you to understand how to use the math acos() function in Javascript to find the arccossine of a number.