You need to change variables. Rectangular is painful. The density here is
, but the k's cancel, so you can let k=1.
Try spherical, where the Jacobian is .
If you're integating over the entire ball, then , and .
You need to change variables. Rectangular is painful. The density here is
, but the k's cancel, so you can let k=1.
Try spherical, where the Jacobian is .
If you're integating over the entire ball, then , and .