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  2. Main Page
  3. Core JavaScript 1.5 Reference
  4. Global Objects
  5. Math
  6. asin
Table of contents
  1. 1. Summary
  2. 2. Syntax
  3. 3. Parameters
  4. 4. Description
  5. 5. Examples
    1. 5.1. Example: Using Math.asin
  6. 6. See Also
Redirected from En/Core JavaScript 1.5 Reference:Objects:Math:asin

asin

Summary

Returns the arcsine (in radians) of a number.

Method of Math

Static

Implemented in: JavaScript 1.0, NES 2.0
ECMA Version: ECMA-262

Syntax

Math.asin(x)

Parameters

x 
A number.

Description

The asin method returns a numeric value between -pi/2 and pi/2 radians for x between -1 and 1. If the value of number is outside this range, it returns NaN.

asin is a static method of Math, so you always use it as Math.asin(), rather than as a method of a Math object you created.

Examples

Example: Using Math.asin

The following function returns the arcsine of the variable x: 

function getAsin(x) {
   return Math.asin(x)
}

If you pass getAsin the value 1, it returns 1.570796326794897 (pi/2); if you pass it the value 2, it returns NaN because 2 is out of range.

See Also

acos, atan, atan2, cos, sin, tan

Page last modified 07:01, 15 Sep 2007 by Mgjbot

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