mathjs/docs/reference/functions/cot.md

Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

# Function cot

Calculate the cotangent of a value. `cot(x)` is defined as `1 / tan(x)`.

For matrices, the function is evaluated element wise.


## Syntax

```js
math.cot(x)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`x` | Number | Boolean | Complex | Unit | Array | Matrix | null | Function input

### Returns

Type | Description
---- | -----------
Number | Complex | Array | Matrix | Cotangent of x


## Examples

```js
math.cot(2);      // returns Number -0.45765755436028577
1 / math.tan(2);  // returns Number -0.45765755436028577
```


## See also

[tan](tan.md),
[sec](sec.md),
[csc](csc.md)


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