docs-v2/content/v2.0/reference/flux/stdlib/math/y0.md

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---
title: math.y0() function
description: The math.y0() function returns the order-zero Bessel function of the second kind.
aliases:
- /v2.0/reference/flux/functions/math/y0/
menu:
v2_0_ref:
name: math.y0
parent: Math
weight: 301
---
The `math.y0()` function returns the order-zero Bessel function of the second kind.
_**Output data type:** Float_
```js
import "math"
math.y0(x: 3.14)
// Returns 0.3289375969127807
```
## Parameters
### x
The value used in the operation.
_**Data type:** Float_
## Special cases
```js
math.y0(x: +Inf) // Returns 0
math.y0(x: 0) // Returns -Inf
math.y0(x: <0) // Returns NaN
math.y0(x: NaN) // Returns NaN
```