mathjs/docs/reference/functions/sec.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 sec

Calculate the secant of a value, defined as `sec(x) = 1/cos(x)`.

For matrices, the function is evaluated element wise.


## Syntax

```js
math.sec(x)
```

### Parameters

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

### Returns

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


## Examples

```js
math.sec(2);      // returns Number -2.4029979617223822
1 / math.cos(2);  // returns Number -2.4029979617223822
```


## See also

[cos](cos.md),
[csc](csc.md),
[cot](cot.md)


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