Add arctg and arcctg predefined operators #4504
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We already have tangent and cotangent in the tg/ctg notation, and we have inverse trig functions with arc prefix, so it would make sense to have arctg and arcctg.
These functions are commonly used where I am from.
There are more trig function with missing inverse versions (cot, sec, csc), so maybe it would make sense to add them too, but I don't know how often they are used if at all.