JavaScript Math tan() Method

The JavaScript Math tan() method is used to calculate the tangent of a number in radians. The tangent of an angle in a right-angled triangle is the ratio of the length of the opposite side to the length of the adjacent side.

Syntax

Math.tan(number) 

Parameters

number(required): It is the angle in radians for which you want to calculate the tangent.

Return Value

Returns the tangent of a number.

  • If the passed value is non-numeric or empty, this method returns NaN.

Visual Representation Visual Representation of JavaScript Math tan() MethodExample 1: How to Use Math tan() Method

let a = 2; //positive value
let b = -2; //negative value
let c = 1.3; //float value
let d = 0; 

console.log(Math.tan(a));
console.log(Math.tan(b));
console.log(Math.tan(c));
console.log(Math.tan(d));

Output

-2.185039863261519
2.185039863261519
3.6021024479679786
0

Example 2: Handling non-numeric and empty valueVisual Representation of Handling non-numeric and empty value

console.log(Math.tan("JavaScript")); //non-numeric value
console.log(Math.tan()); //empty value

Output

NaN
NaN

Example 3: Passing PI as an argument

console.log(Math.tan(Math.PI));
console.log(Math.tan(Math.PI / 4)); //45 degrees

Output

-1.2246467991473532e-16
0.9999999999999999

Browser compatibility

  • Google Chrome 1 and above
  • Edge 12 and above
  • Firefox 1 and above
  • Opera 3 and above
  • Safari 1 and above

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