Math.cos()

The Math.cos() function returns the cosine of a number in radians.

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Syntax

Math.cos(x)

Parameters

x

A number representing an angle in radians.

Return value

The cosine of x, between -1 and 1, inclusive. If x is Infinity, -Infinity, or NaN, returns NaN.

Description

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(-Infinity); // NaN
Math.cos(-0); // 1
Math.cos(0); // 1
Math.cos(1); // 0.5403023058681398
Math.cos(Math.PI); // -1
Math.cos(2 * Math.PI); // 1
Math.cos(Infinity); // NaN

Specifications

Specification
ECMAScript Language Specification
# sec-math.cos

Browser compatibility

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See also