You can use a function like this to do the conversion:

```
function toDegrees (angle) {
return angle * (180 / Math.PI);
}
```

Note that functions like `sin`

, `cos`

, and so on *do not return angles* , they take angles as input. It seems to me that it would be more useful to you to have a function that converts a degree input to radians, like this:

```
function toRadians (angle) {
return angle * (Math.PI / 180);
}
```

which you could use to do something like `tan(toRadians(45))`

.