Your solution in the other thread worked perfectly, and it was easy to implement! Thank you very much. I'm developing an FPS template for anyone to use, and this was a major road block. I made sure to credit you in the project files as well!
If you're interested in checking out the template, here is the download link!
https://miasmageek.itch.io/1st-person-example
Hard to say what you’re trying to calculate with the angles and how.
If you are just turning you could just set the bullets angle to the cameras angle.
If you look up and down too you can use spherical coordinates to get the orientation from two angles. But your math doesn’t look like that.
Here’s a way to just shoot in the direction the camera is facing. Maybe something like that is what you’re after?
https://www.construct.net/en/forum/construct-3/how-do-i-8/bullet-fire-center-screen-3d-166334?kws=3dcamera#forumPost1060482