There is a node function you can use to get this value. It goes from -180' to '180. The roll will always be 0.
thank your 
If I answered your question, could you mark as answer?
Hi, im trying to get a angle between 2 vectors.
The normal method i normally use is the dot product but as it is related to cos i can only get a range from (0-180) (in degrees). What if i want to get a angle with a (0-360) degree range? Mathematically could use determinant but… how can i use determinant in UE4? im new at UE4 so sorry for low lvl question 
In addition what Ben has suggested, you can also lookup ‘Rotation from XVector’ …
Thanks
sure, sorry for the time
haha, its fine, though you didn’t mark it as answered. There is a button below the voting to mark this answer, which will also mark your question as answered 