# Math.asin()

## BaselineWidely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

La Funcion Math.asin() retorna El arco seno (en radianes) de un número, eso es.

$∀ x ∊ [ - 1 ; 1 ] , Math.asin ( x ) = arcsin ( x ) = the unique y ∊ [ - π 2 ; π 2 ] such that sin ( y ) = x \forall x \in [{-1};1],;\mathtt{\operatorname{Math.asin}(x)} = \arcsin(x) = \text{ the unique } ; y \in \left[-\frac{\pi}{2}; \frac{\pi}{2}\right] , \text{such that} ; \sin(y) = x$

## Syntax

Math.asin(x)


### Parametros

x

Un Numero.

### Return value

The arcsine (in radians) of the given number if it's between -1 and 1; otherwise, NaN.

## Descripcion

The Math.asin() method returns a numeric value between $-\frac\left\{\pi\right\}\left\{2\right\}$ and $\frac\left\{\pi\right\}\left\{2\right\}$ radians for x between -1 and 1. If the value of x is outside this range, it returns NaN.

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

## Ejemplos

### Usando Math.asin()

js
Math.asin(-2); // NaN
Math.asin(-1); // -1.5707963267948966 (-pi/2)
Math.asin(0); // 0
Math.asin(0.5); // 0.5235987755982989
Math.asin(1); // 1.5707963267948966 (pi/2)
Math.asin(2); // NaN


For values less than -1 or greater than 1, Math.asin() returns NaN.

## Especificaciones

Specification
ECMAScript Language Specification
# sec-math.asin