No, @A-LevelStudent keeping questions closed will still keep them on site, as examples. I'm not saying that we shouldn't retain useful information, but as it stands that information is not searchable at all. Furthermore, given that $\cot(90-A) = tan(A)$, it is sufficient to prove that $arctan(2 - \sqrt{3}) = 15$ , which has a post
here. The irony is that there is a common answerer on both...