asin()  Math  class methodS2C Home  « Globals « Math « asin()


Returns the arcsine of a number in radians between -PI/2 and PI/2.

  • Radians to Degrees - divide number by (Math.PI / 180).
  • Degrees to Radians - multiply number by (Math.PI * 180).
  • Like all class methods asin() should be used on the class rather than an instance of the class.


Signature Description
Math.asin(value)Returns the arcsine of a number in radians between -PI/2 and PI/2.


Parameter Description
valueThe value you wish to find the arcsine in radians for:
  • A number in the range -1 to 1.
  • Values outside this range return NaN.


The code below displays asin() usage.

 * Store results in an array.
var asinValues = new Array(5);
asinValues[0] = Math.asin(-1);
asinValues[1] = Math.asin(0);
asinValues[2] = Math.asin(0.75);
asinValues[3] = Math.asin(-2);
asinValues[4] = Math.asin('a string');
asinValues[5] = Math.asin();

Press the button below to action the above code:

Related Tutorials

JavaScript Advanced Tutorials - Lesson 4 - Math

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