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# Is NaN

## <mark style="color:purple;">`is_nan`</mark>(*decimal*) -> *bool*

Returns bool

True if input Nan and False if input not Nan

<details>

<summary>Example:</summary>

<mark style="color:red;">`is_nan(Nan)`</mark> → <mark style="color:red;">`true`</mark>

<mark style="color:red;">`is_nan(1.1)`</mark> → <mark style="color:red;">`false`</mark>

</details>