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### `cartesian(radius, angle)`
Converts a polar coordinate given with `radius` and an `angle` in radians to a cartesian coordinate (x and y).

Returns:
An object `{ x: resultX, y: resultY }`.

#### Example:

The result in `cartesianCoordinate` will be `{ x: 86.60254037844388, y: 50 }`.
```javascript
let cartesianCoordinate = gmynd.cartesian(100, gmynd.radians(30));
```