- To: mathgroup at smc.vnet.net
- Subject: [mg110366] Simplification question
- From: Yaroslav Bulatov <yaroslavvb at gmail.com>
- Date: Tue, 15 Jun 2010 02:30:39 -0400 (EDT)
I'd like to verify that the following expression is true for a,b real. It seems to hold numerically. 1/2 Log[(Exp[a + b] + Exp[-a - b])/(Exp[-a + b] + Exp[a - b])] == ArcTanh[Tanh[a] Tanh[b]] I tried Reduce and combinations of TrigToExp/Simplify with no luck, any suggestions?