# cos

`import { cos } from "destack:tensor";`

Return elementwise cosine.

```ds title="cos"
export declare function cos<T: Float, const Rank: usize>(tensor: Tensor<T, Rank>, options?: TensorOutputOptions<T, Rank> | undefined): Tensor<T, Rank>
```

[language/library/src/tensor/ops.ds:157:160](https://github.com/destack-sh/destack/blob/main/language/library/src/tensor/ops.ds#L157-L160)