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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[-π2;π2]such thatsin(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




Un Numero.

Return value

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


The Math.asin() method returns a numeric value between -π2-\frac{\pi}{2} and π2\frac{\pi}{2} 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).


Usando Math.asin()

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.


Espesificacion Estado Comentario
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262)
La definición de 'Math.asin' en esta especificación.
ECMAScript 2015 (6th Edition, ECMA-262)
La definición de 'Math.asin' en esta especificación.
ECMAScript Latest Draft (ECMA-262)
La definición de 'Math.asin' en esta especificación.

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