JavaScript Math.sin() Method

Quiz

The Math.sin() method in JavaScript is used to calculate the sune value of the provided number (in radians). This method returns a "numeric value" that represents sine value of a given angle (in radians). If the provided argument to this method is NaN or Infinity values, it returns NaN as result.

Syntax

Following is the syntax of JavaScript Math.sin() method −

Math.sin(x)

Parameters

This method accepts only one parameter. The same is described below −

x: A numeric value representing angle in radians.

Return value

This method returns a numeric value (between -1 and 1, inclusive) representing the sine of the specified angle.

Example 1

In the following example, we are using the JavaScript Math.sin() method to calculate the sine value of 2 radians −

<html>
<body>
<script>
   const result = Math.sin(2);
   document.write(result);
</script>
</body>
</html>

Output

If we execute the above program, it will return approximately "0.9092".

Example 2

Here, we are computing the sine value of negative 5 radians −

<html>
<body>
<script>
   const result = Math.sin(-5);
   document.write(result);
</script>
</body>
</html>

Output

It will return approximately 0.95892 as result.

Example 3

In the below example, we are computing the sine value of math constant "PI" −

<html>
<body>
<script>
   const result = Math.sin(Math.PI); //3.14
   document.write(result);
</script>
</body>
</html>

Output

The output 1.2246467991473532e-16 represents -1.2246467991473532 × 10^-16

Example 4

If we try to calculate the sine value of a "string", this method will return NaN as result −

<html>
<body>
<script>
   const result = Math.sin("Tutorialspoint");
   document.write(result);
</script>
</body>
</html>

Output

As we can see in the output below, it returned NaN as result.

Example 5

The Math.sin() method doesn't treat "Infinity" as a number, so if we pass this as an argument, this method returns NaN as result −

<html>
<body>
<script>
   const result1 = Math.sin(Infinity);
   const result2 = Math.sin(-Infinity);
   document.write(result1, "<br>", result2);
</script>
</body>
</html>

Output

As we can see in the output below, it returned NaN for both positive and negative Infinity.

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