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Version: 3.35.1

Math.asin()

The Math.asin() function returns the inverse sine (in radians) of a number.

Syntax​

Math.asin(x)

Parameters​

  • x
    • : A number between -1 and 1, inclusive, representing the angle's sine value.

Return value​

The inverse sine (angle in radians between -π2-\frac{\pi}{2} and π2\frac{\pi}{2}, inclusive) of x. If x is less than -1 or greater than 1, returns NaN.

Description​

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).