cos()  Math  class method JS Home  <<  JS Reference  <<  Math  <<  cos()

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Description

Returns the cosine of a number in radians.

• Radians to Degrees - divide number by (Math.PI / 180).
• Degrees to Radians - multiply number by (Math.PI * 180).

• Like all class methods cos() should be used on the class rather than an instance of the class.

Syntax

Parameters

Examples

The code below displays cos() usage.

// Store results in an array.
var cosValues = new Array(5);

cosValues[0] = Math.cos(-1);
cosValues[1] = Math.cos(0);
cosValues[2] = Math.cos('0.75');
cosValues[3] = Math.cos('a string');
cosValues[4] = Math.cos();
cosValues[5] = Math.cos(null);

alert(cosValues);  

Related Tutorials

JavaScript Advanced Tutorials - Lesson 4 - Math

• <<    ceil()
• exp()     >>