atan

The atan() method returns the arctangent of a number, that is, the angle (in radians) whose tangent is equal to the given value. It is the inverse function of tan().

Interactive example

Syntax

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

Parameters

• input: A number representing the tangent of an angle.

Return value

The angle in radians (between -π/2 and π/2) whose tangent equals the given value.

See also

• tan - Calculates the tangent of an angle
• atan2 - Calculates the arctangent of y/x with quadrant handling
• asin - Calculates the arcsine

Sources

• MDN Web Docs - Math.atan()