The tan() function of the Math object accepts an angle (in radians) and returns its tangent value.
Syntax
Its Syntax is as follows
Math.tan(90)
Example
<html>
<head>
<title>JavaScript Example</title>
</head>
<body>
<script type="text/javascript">
var result = Math.tan(90);
document.write("Tangent value of the given angle: "+result);
</script>
</body>
</html>Output
Tangent value of the given angle: -1.995200412208242