Re: TraditionForm Appears to be Inconsistent

*To*: mathgroup at smc.vnet.net*Subject*: [mg99585] Re: TraditionForm Appears to be Inconsistent*From*: "Sjoerd C. de Vries" <sjoerd.c.devries at gmail.com>*Date*: Fri, 8 May 2009 00:18:32 -0400 (EDT)*References*: <gtudpr$j63$1@smc.vnet.net>

Hi Chris, This has nothing to do with TraditionalForm, but more with automatic simplification. If you enter TraditionalForm[ Exp[I \[Theta]] == Cos[\[Theta]] + I Sin[\[Theta]] // ComplexExpand] you get True in the first case as well. If you want to show the second equation in traditional form you could use TraditionalForm[Cos[x] == Sin[x + \[Pi]/2] // HoldForm] or just write it in a text cell and then use the menu Cell/Convert to/ Traditional form. Cheers -- Sjoerd On May 7, 12:39 pm, uk.org.micros... at googlemail.com wrote: > Hi > > The Mathematica 7 documentation says that > > TraditionalForm[Exp[I \[Theta]] == Cos[\[Theta]] + I Sin[\[Theta]]] > > will display the expression in traditional form, and indeed it does. > However, the following evaluates the expression and then displays True > in traditional form: > > TraditionalForm[Cos[x] == Sin[x + \[Pi]/2]] > > Why is TraditionalForm behaving differently in these two apparently > identical situations, and how can I get Mathematica to display this > trigonometric identity in traditional form? > > Thanks in advance > > Chris