Re: Re: Wrestling with Mathematica on Trig Simplification

• To: mathgroup at smc.vnet.net
• Subject: [mg32618] Re: Re: Wrestling with Mathematica on Trig Simplification
• From: "Ranit" <fink at ee.columbia.edu>
• Date: Thu, 31 Jan 2002 01:46:03 -0500 (EST)
• Organization: Columbia University
• References: <a1j768\$r58\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Do you know a good book or site that teaches mathematica?

"David Park" <djmp at earthlink.net> wrote in message
news:a1j768\$r58\$1 at smc.vnet.net...
> Steven,
>
> It isn't absolute necessary to write the definition this way.
>
> m[a_, b_][t_] := a Sin[t] + b Cos[t]
>
> In you initial posting you didn't define a and b as arguments of the
> function at all. I think that is because you considered them as parameters
> and t as the variable. Writing the above form cleanly separates the
> parameters from the variable.
> Also you can easily write the derivative with respect to the variable.
>
> m[a, b]'[t]
> a Cos[t] - b Sin[t]
>
> But it is really a matter of taste and how you are going to use the
> definition.
>
> David Park
>
> > From: Poppo [mailto:rlsmith at his.com]
To: mathgroup at smc.vnet.net
>
> >
> > Why write m[a_,b_][t_] instead of m[a_,b_,t_]?
> >
> >
>
>

```

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