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Showing that ArcSinh/ArcCsch is 3?
I hope I've just overlooked something very simple. I want to transform ArcSinh/ArcCsch to 3, using just "knowledge" already implemented in Mathematica. I tried FullSimplify first, and it doesn't help. I tried several other things. For example, TrigToExp[ArcSinh/ArcCsch] yields Log[2 + Sqrt]/Log[1/2 + Sqrt/2]. But then how should we transform that to 3? David