Math.tan

The Math.tan() function returns the tangent of a number.

Syntax

Math.tan(x)

Parameters

x

A number representing an angle in radians.

Return value

The tangent of the given number.

Description

The Math.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 (Math is not a constructor).

Examples

Using Math.tan()

Math.tan(1); // 1.5574077246549023

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);
}

Specifications

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262) The definition of 'Math.tan' in that specification.	Standard
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Math.tan' in that specification.	Standard
ECMAScript 2017 Draft (ECMA-262) The definition of 'Math.tan' in that specification.	Draft

Browser compatibility

See also

• Math.acos()
• Math.asin()
• Math.atan()
• Math.atan2()
• Math.cos()
• Math.sin()