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Re: Simplify

• To: mathgroup at smc.vnet.net
• Subject: [mg127663] Re: Simplify
• From: "Dr. Wolfgang Hintze" <weh at snafu.de>
• Date: Tue, 14 Aug 2012 04:20:01 -0400 (EDT)
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On 13 Aug., 09:20, "news" <n... at newsfe03.iad.highwinds-media.com>
wrote:
> Hi folks,
>
> Simplify must result:
>
> Simplify[(1 + Sin[x] - Cos[x])/(1 + Sin[x] + Cos[x]) == Tan[x/2]]
> True
>
> but why instead it results:
>
> Simplify[(1 + Sin[x] - Cos[x]) / (1 + Sin[x] + Cox[x]) ==  Tan[x/2]]
>
> ((Cos[x] - Cox[x])*Tan[x/2]) / (1 + Cox[x] + Sin[x]) == 0
>
> Thanks.
>
> Max.
>
>

Max, I get

In[90]:= Simplify[(1 + Sin[x] - Cos[x])/(1 + Sin[x] + Cos[x])]

Out[90]= Tan[x/2]

and also

In[89]:= Simplify[(1 + Sin[x] - Cos[x])/(1 + Sin[x] + Cos[x]) == Tan[x/
2]]

Out[89]= True

and I don't see where you strange second line may come from.

Best Ragards,
Wolfgang