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JavaScript Math acos() Method

JavaScript Math acos() Method with example, javascript math methods, abs() method, round() method, ceil() method, floor() method, pow() method, random() method, sqrt() method, max() method, min() method, log() method, sin() method, cos() method, tan() method etc.

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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:

Math.acos(num)

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.

<script>
document.writeln(Math.acos(-1)+"<br>");
document.writeln(Math.acos(0)+"<br>");
document.writeln(Math.acos(0.5)+"<br>");
document.writeln(Math.acos(1));
</script>
Test it Now

Output:

3.141592653589793
1.5707963267948966
1.0471975511965979
0

Example 2

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

<script>
document.writeln(Math.acos()+"<br>");
document.writeln(Math.acos(2)+"<br>");
document.writeln(Math.acos(-2));
</script>
Test it Now

Output:

NaN
NaN
NaN

Example 3

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

<script>
function display()
{
  var x=document.getElementById("num").value;
document.getElementById("result").innerHTML=Math.acos(x);
}
</script>
<form>
  Enter a number: <input type="text" id="num">
  <input type="button"  onclick="display()" value="submit">
  </form>
  <p><span id="result"></span></p>
Test it Now
Next TopicJavaScript Math




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