I am pursuing 10th, as my model test in trignometric is going to held by next week. I have some clarification regarding trignometric portion. Calculating Atan2 based on X & Y axis is an important and repetitive question in exams, I have searched about how to solve in atan2 calculator in easycalculation website.

My doubt is, will I get question Atan2 based on X & Y axis alone or do they ask for about triple based axis i.e X,Y & Z axis? If so, how to calculate?