# ee.Array.tan

On an element-wise basis, computes the tangent of the input in radians.

<br />

| Usage | Returns |
|---|---|
| `Array.tan()` | Array |

| Argument | Type | Details |
|---|---|---|
| this: `input` | Array | The input array. |

## Examples

### Code Editor (JavaScript)

```javascript
var π = Math.PI;
print(ee.Array([-π / 4]).tan());  // [Almost -1]
print(ee.Array([0]).tan());  // [0]
print(ee.Array([π / 4]).tan());  // [Almost 1]

var start = -π / 3;
var end = π / 3;
var points = ee.Array(ee.List.sequence(start, end, null, 50));
var values = points.tan();

// Plot tan() defined above.
var chart = ui.Chart.array.values(values, 0, points)
    .setOptions({
      viewWindow: {min: start, max: end},
      hAxis: {
        title: 'x',
        viewWindowMode: 'maximized',
        ticks: [
          {v: start, f: '-π / 3'},
          {v: 0, f: 0},
          {v: end, f: 'π / 3'}]
      },
      vAxis: {
        title: 'tan(x)',
        ticks: [
          {v: -Math.sqrt(3), f: '-√3'},
          {v: 0},
          {v: Math.sqrt(3), f: '√3'}]
      },
      lineWidth: 1,
      pointSize: 0,
    });
print(chart);
```
Python setup

See the [Python Environment](https://developers.google.com/earth-engine/guides/python_install) page for information on the Python API and using
`geemap` for interactive development.

```python
import ee
import geemap.core as geemap
```

### Colab (Python)

```python
import math
import altair as alt
import pandas as pd

π = math.pi
display(ee.Array([-π / 4]).tan())  # [Almost -1]
display(ee.Array([0]).tan())  # [0]
display(ee.Array([π / 4]).tan())  # [Almost 1]

start = -π / 3
end = π / 3
points = ee.Array(ee.List.sequence(start, end, None, 50))
values = points.tan()

df = pd.DataFrame({'x': points.getInfo(), 'tan(x)': values.getInfo()})

# Plot tan() defined above.
alt.Chart(df).mark_line().encode(
    x=alt.X('x', axis=alt.Axis(values=[start, 0, end])),
    y=alt.Y('tan(x)', axis=alt.Axis(values=[-math.sqrt(3), 0, math.sqrt(3)]))
)
```