# tensorplay.functional.cos

Source: https://www.tensorplay.cn/docs/generated/tensorplay.functional.cos.html

```python
tensorplay.functional.cos(input, *, out=None) → Tensor
```

Returns a new tensor with the cosine  of the elements of input.

$$\text{out}_{i} = \cos(\text{input}_{i})$$

Parameters:

input ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor)) – the input tensor.

Keyword Arguments:

out ([Tensor](/docs/generated/tensorplay.Tensor.html#tensorplay.Tensor), optional) – the output tensor.

Example:

```
>>> a = tensorplay.randn(4)
>>> a
tensor([ 1.4309,  1.2706, -0.8562,  0.9796])
>>> tensorplay.cos(a)
tensor([ 0.1395,  0.2957,  0.6553,  0.5574])
```