I have a formula that maps a random point in space to a point that sits in a sphere. I want to be able to reverse this formula to get the random point in space again.

My `unspherize()` function below is not working. Please show me the correct way to reverse the form.

```
function spherize(x,y,z){
  var d = 1 / Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2));
  x *= d;
  y *= d;
  z *= d;
  return {x: x, y: y, z: z}
}

function unspherize(x,y,z){
  var d = 1 * Math.pow(Math.sqrt(x) + Math.sqrt(y) + Math.sqrt(z), 2)
  x /= d;
  y /= d;
  z /= d;
  return {x: x, y: y, z: z}
}

```