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Re: TraditionForm Appears to be Inconsistent

• To: mathgroup at smc.vnet.net
• Subject: [mg99562] Re: [mg99551] TraditionForm Appears to be Inconsistent
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Fri, 8 May 2009 00:14:19 -0400 (EDT)
• Reply-to: hanlonr at cox.net

It will automatically simplify some forms. Use HoldForm to stop this.

TraditionalForm[Exp[I \[Theta]] == Cos[\[Theta]] + I Sin[\[Theta]]]

E^(I \[Theta])\[LongEqual]cos(\[Theta])+I sin(\[Theta])

% // Simplify

True

TraditionalForm[HoldForm[Cos[x] == Sin[x + \[Pi]/2]]]

cos(x)\[LongEqual]sin(x+\[Pi]/2)

ReleaseHold[%]

True



Bob Hanlon


On Thu, May 7, 2009 at 8:19 AM , uk.org.microserf 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