---
title: math.sin() function
description: >
  `math.sin()` returns the sine of the radian argument `x`.
menu:
  flux_v0_ref:
    name: math.sin
    parent: math
    identifier: math/sin
weight: 101
---

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`math.sin()` returns the sine of the radian argument `x`.



##### Function type signature

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

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

### x
({{< req >}})
Radian value to use in the operation.




## Examples

- [Return the sine of a radian value](#return-the-sine-of-a-radian-value)
- [Use math.sin in map](#use-mathsin-in-map)

### Return the sine of a radian value

```js
import "math"

math.sin(x: 3.14)// 0.0015926529164868282


```


### Use math.sin in map

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

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

```

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{{% expand "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 | -0.8201039476213742 | t1   |
| 2021-01-01T00:00:10Z | -0.9971456224759652 | t1   |
| 2021-01-01T00:00:20Z | 0.8756667135928823  | t1   |
| 2021-01-01T00:00:30Z | -0.9686047952311415 | t1   |
| 2021-01-01T00:00:40Z | 0.4599716480084409  | t1   |
| 2021-01-01T00:00:50Z | -0.9603924882355435 | t1   |

| _time                | _value              | *tag |
| -------------------- | ------------------- | ---- |
| 2021-01-01T00:00:00Z | 0.8417108384451784  | t2   |
| 2021-01-01T00:00:10Z | -0.9670013802437661 | t2   |
| 2021-01-01T00:00:20Z | 0.5715613187423438  | t2   |
| 2021-01-01T00:00:30Z | 0.7958705732618963  | t2   |
| 2021-01-01T00:00:40Z | 0.9618345122584524  | t2   |
| 2021-01-01T00:00:50Z | 0.9584712830789142  | t2   |

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