Math.sin()

{{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()")}}