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Showing content from http://developer.mozilla.org/es/docs/Web/JavaScript/Reference/Global_Objects/Math/asin below:

Math.asin() - JavaScript | MDN

Math.asin()

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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 ∊ [ - 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 Parametros 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 - π 2 -\frac{\pi}{2} and π 2 \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).

Ejemplos 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.

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