Is There A Megafunction For Arctan ?

I don't want to start a polemic here (I sincerely hope I didn't).

A lot of people visiting this forum are not at a university or working in a large(r) company, yet are very experienced and have solved real-life projects. I think it is a matter of politeness that if you bring an argument into a discussion that other parties can explore that argument and eventually learn from it.