asin

The asin() method returns the arcsine of a number, that is, the angle (in radians) whose sine is equal to the given value. It is the inverse function of sin().

Interactive example

Syntax

function asin<
	GenericInput extends number,
>(input: GenericInput): number

Parameters

• input: A number between -1 and 1 representing the sine of an angle.

Return value

The angle in radians (between -π/2 and π/2) whose sine equals the given value. Returns NaN if the value is outside the interval [-1, 1].

See also

• sin - Calculates the sine of an angle
• acos - Calculates the arccosine
• atan - Calculates the arctangent

Sources

• MDN Web Docs - Math.asin()