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<h1 id="function-sin">Function sin <a href="#function-sin" title="Permalink">#</a></h1>

Calculate the sine of a value.

To avoid confusion with the matrix sine, this function does not apply
to matrices.


<h2 id="syntax">Syntax <a href="#syntax" title="Permalink">#</a></h2>

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

<h3 id="parameters">Parameters <a href="#parameters" title="Permalink">#</a></h3>

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

<h3 id="returns">Returns <a href="#returns" title="Permalink">#</a></h3>

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


<h3 id="throws">Throws <a href="#throws" title="Permalink">#</a></h3>

Type | Description
---- | -----------


<h2 id="examples">Examples <a href="#examples" title="Permalink">#</a></h2>

```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
```


<h2 id="see-also">See also <a href="#see-also" title="Permalink">#</a></h2>

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