Core JavaScript 1.5 Reference:Global Objects:Math:tan

From MDC

Contents 1 Summary 2 Syntax 3 Parameters 4 Description 5 Examples 5.1 Example: Using Math.tan 6 See Also

[edit] Summary

Returns the tangent of a number.

Method of Math
Static
Implemented in:	JavaScript 1.0, NES 2.0
ECMA Version:	ECMA-262

[edit] Syntax

Math.tan(x)

[edit] Parameters

x 

A number representing an angle in radians.

[edit] Description

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

Because tan is a static method of Math, you always use it as Math.tan(), rather than as a method of a Math object you created.

[edit] Examples

[edit] Example: Using Math.tan

The following function returns the tangent of the variable x:

function getTan(x) {
   return Math.tan(x)
}

Because the Math.tan() function accepts radians, but it is often easier to work with degrees, the following function accepts a value in degrees, converts it to radians and returns the tangent.

function getTanDeg(deg) {
   var rad = deg * Math.PI/180;
   return Math.tan(rad)
}

[edit] See Also

acos, asin, atan, atan2, cos, sin