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Re: usage of TrigToExp?

• To: mathgroup at smc.vnet.net
• Subject: [mg95449] Re: usage of TrigToExp?
• From: Helen Read <hpr at together.net>
• Date: Mon, 19 Jan 2009 02:55:52 -0500 (EST)
• References: <gkv0a9$de1$1@smc.vnet.net>
• Reply-to: HPR <read at math.uvm.edu>

zatuch wrote:
> Hello,
> Results from function TrigToExp seemed weird to me. Could anyone
> please give me a good explanation on its usage. Thanks a lot.
> 
> In[41]:= TrigToExp[Cos[2 x]]
> During evaluation of In[41]:= Nonreal::warning: Nonreal number
> encountered.
> Out[41]= Nonreal
> 
> In[43]:= TrigToExp[Cos[y] Sin[x]]
> Out[43]= 0

It looks as though you loaded the old Miscellanous`RealOnly package. Try 
again in a fresh session, without loading RealOnly.

-- 
Helen Read
University of VErmont