JavaScript Math acos() method

The JavaScript math acos() method returns the arccosine of the given number in the form of radians. The acos() method must be in the range -1 to 1, otherwise it returns NaN.

Syntax

The acos() method is represented by the following syntax:

Parameter

num - A number.

Return

The arccosine of the number.

JavaScript Math acos() method example

Here, we will understand acos() method through various examples.

Example 1

Let's see a simple example of acos() method.

Output:

3.141592653589793
1.5707963267948966
1.0471975511965979
0

Example 2

Let's see some cases where acos() method returns NaN.

Output:

NaN
NaN
NaN

Example 3

Here, you can test acos() method with your own test cases.