convert - How to calculate Distance, Azimuth and Dip from two XYZ coordinates

I have two XYZ coordinates and I would like to calculate the Distance, Azimuth and Dip between them.

I have come across a similar question on this site that calculates it the other way around (with a given starting coordinate and a given Distance, Azimuth and Dip and it calculates an end coordinate.)

I have been trying to figure it out and I am sure its very simple.

Here is that other question page. It says that this is a conversion between a spherical and Cartesian coordinates.

How to convert Distance, Azimuth, Dip to XYZ?