Trigonometric problem, polar coordinates calculation

Hi, I got the following trigonometric problem

I know the three coordinatesn,cartesian, of the two point and also the angle of 60 degrees between the line of equation z=33 and the versor v1. I would calculate the angle alpha between the versors v1 and v2. The following figure represents the xy plane

I would calculate the angle theta placed on the azimuth plane. Thanks to all for the help!!!