# tan()

Calculates the ratio of the sine and cosine of an angle.

## Examples

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![example picture for tan()](/images/reference/Sketch_tan_0.png)

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```python
def setup():
    a = 0
    for i in range(50):
        py5.line(2*i, 50, 2*i, 50+2*py5.tan(a))
        a += py5.TWO_PI/50
```

</div></div>

</div>

## Description

Calculates the ratio of the sine and cosine of an angle. This function expects the values of the angle parameter to be provided in radians (values from `0` to `TWO_PI`). Values are returned in the range infinity to -infinity.

This function makes a call to the numpy `tan()` function.

## Signatures

```python
tan(
    angle: Union[float, npt.ArrayLike],  # angle in radians
) -> Union[float, npt.NDArray]
```

Updated on August 23, 2025 19:59:53pm UTC