---
title: math.tan() function
description: math.tan() returns the tangent of the radian argument x.
url: https://docs.influxdata.com/flux/v0/stdlib/math/tan/
estimated_tokens: 1405
product: Flux
version: v0
---

# math.tan() function

-   Flux 0.22.0+
-   View InfluxDB support

`math.tan()` returns the tangent of the radian argument `x`.

##### Function type signature

```js
(x: float) => float
```

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### x

(Required) Value to operate on.

## Examples

-   [Return the tangent of a radian value](#return-the-tangent-of-a-radian-value)
-   [Use math.tan in map](#use-mathtan-in-map)

### Return the tangent of a radian value

```js
import "math"

math.tan(x: 3.14)// -0.001592654936407223

```

### Use math.tan in map

```js
import "math"
import "sampledata"

sampledata.float()
    |> map(fn: (r) => ({r with _value: math.tan(x: r._value)}))
```

[](#view-example-input-and-output)

View example input and output

#### Input data

| _time | *tag | _value |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | t1 | -2.18 |
| 2021-01-01T00:00:10Z | t1 | 10.92 |
| 2021-01-01T00:00:20Z | t1 | 7.35 |
| 2021-01-01T00:00:30Z | t1 | 17.53 |
| 2021-01-01T00:00:40Z | t1 | 15.23 |
| 2021-01-01T00:00:50Z | t1 | 4.43 |

| _time | *tag | _value |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | t2 | 19.85 |
| 2021-01-01T00:00:10Z | t2 | 4.97 |
| 2021-01-01T00:00:20Z | t2 | -3.75 |
| 2021-01-01T00:00:30Z | t2 | 19.77 |
| 2021-01-01T00:00:40Z | t2 | 13.86 |
| 2021-01-01T00:00:50Z | t2 | 1.86 |

#### Output data

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 1.4332105287001917 | t1 |
| 2021-01-01T00:00:10Z | 13.206812562189944 | t1 |
| 2021-01-01T00:00:20Z | 1.8132901361470621 | t1 |
| 2021-01-01T00:00:30Z | -3.8961501504145963 | t1 |
| 2021-01-01T00:00:40Z | -0.5180248236402568 | t1 |
| 2021-01-01T00:00:50Z | 3.446580763443108 | t1 |

| _time | _value | *tag |
| --- | --- | --- |
| 2021-01-01T00:00:00Z | 1.5589299766884657 | t2 |
| 2021-01-01T00:00:10Z | -3.7955688539089367 | t2 |
| 2021-01-01T00:00:20Z | -0.6965508511114601 | t2 |
| 2021-01-01T00:00:30Z | 1.3144743689586664 | t2 |
| 2021-01-01T00:00:40Z | 3.515068256260714 | t2 |
| 2021-01-01T00:00:50Z | -3.3608276755646553 | t2 |