mathjs/docs/reference/functions/sin.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

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# Function sin

Calculate the sine of a value.

For matrices, the function is evaluated element wise.


## Syntax

```js
math.sin(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | number &#124; BigNumber &#124; Complex &#124; Unit &#124; Array &#124; Matrix | Function input

### Returns

Type | Description
---- | -----------
number &#124; BigNumber &#124; Complex &#124; Array &#124; Matrix | Sine of x


## Examples

```js
math.sin(2)                      // returns number 0.9092974268256813
math.sin(math.pi / 4)            // returns number 0.7071067811865475
math.sin(math.unit(90, 'deg'))   // returns number 1
math.sin(math.unit(30, 'deg'))   // returns number 0.5

const angle = 0.2
math.pow(math.sin(angle), 2) + math.pow(math.cos(angle), 2) // returns number ~1
```


## See also

[cos](cos.md),
[tan](tan.md)