Math.cos

The Math.cos() static function returns the cosine of the specified angle, which must be specified in radians. This value is ${\displaystyle \frac{{\text{length}}_{\text{adjacent}}}{{\text{length}}_{\text{hypotenuse}}}}$.

Syntax

Math.cos(x)

Parameters

x

The angle in radians for which to return the cosine.

Return value

The cosine of the given number.

Description

The Math.cos() method returns a numeric value between -1 and 1, which represents the cosine of the angle.

Because cos() is a static method of Math, you always use it as Math.cos(), rather than as a method of a Math object you created (Math is not a constructor).

Examples

Using Math.cos()

Math.cos(0);           // 1
Math.cos(1);           // 0.5403023058681398

Math.cos(Math.PI);     // -1
Math.cos(2 * Math.PI); // 1

Specifications

Browser compatibility

See also

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