metadata
title: Math.sin()
short-title: sin()
slug: Web/JavaScript/Reference/Global_Objects/Math/sin
page-type: javascript-static-method
browser-compat: javascript.builtins.Math.sin
sidebar: jsref
The Math.sin() static method returns the sine of a number in radians.
{{InteractiveExample("JavaScript Demo: Math.sin()")}}
function getCircleY(radians, radius) {
return Math.sin(radians) * radius;
}
console.log(getCircleY(1, 10));
// Expected output: 8.414709848078965
console.log(getCircleY(2, 10));
// Expected output: 9.092974268256818
console.log(getCircleY(Math.PI, 10));
// Expected output: 1.2246467991473533e-15
Syntax
Math.sin(x)
Parameters
x- : A number representing an angle in radians.
Return value
The sine of x, between -1 and 1, inclusive. If x is {{jsxref("Infinity")}}, -Infinity, or {{jsxref("NaN")}}, returns {{jsxref("NaN")}}.
Description
Because sin() is a static method of Math, you always use it as Math.sin(), rather than as a method of a Math object you created (Math is not a constructor).
Examples
Using Math.sin()
Math.sin(-Infinity); // NaN
Math.sin(-0); // -0
Math.sin(0); // 0
Math.sin(1); // 0.8414709848078965
Math.sin(Math.PI / 2); // 1
Math.sin(Infinity); // NaN
Specifications
{{Specifications}}
Browser compatibility
{{Compat}}
See also
- {{jsxref("Math.acos()")}}
- {{jsxref("Math.asin()")}}
- {{jsxref("Math.atan()")}}
- {{jsxref("Math.atan2()")}}
- {{jsxref("Math.cos()")}}
- {{jsxref("Math.tan()")}}
- CSS {{cssxref("sin()")}} function