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# Javascript Math - tan Method

## Description:

This method returns the tangent of a number. The tan method returns a numeric value that represents the tangent of the angle.

## Syntax:

    Math.tan( x ) ;

Here is the detail of parameters:

- x: A number representing an angle in radians.

## Return Value:

Returns the tangent of a number.

## Example:

    <html>
    <head>
    <title>JavaScript Math tan() Method</title>
    </head>
    <body>
    <script type="text/javascript">

    var value = Math.tan( -30 );
    document.write("First Test Value : " + value );

    var value = Math.tan( 90 );
    document.write("<br />Second Test Value : " + value );

    var value = Math.tan( 45 );
    document.write("<br />Third Test Value : " + value );

    var value = Math.tan( Math.PI/180 );
    document.write("<br />Fourth Test Value : " + value );
    </script>
    </body>
    </html>

This will produce following result:

    First Test Value : 1
    Second Test Value : 21
    Third Test Value : 20
    Fourth Test Value : -20

To understand it in better way you can Try it yourself.

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