       Re: Ask Mathematica to sub for a long expression

• To: mathgroup at smc.vnet.net
• Subject: [mg71892] Re: Ask Mathematica to sub for a long expression
• From: "dimitris" <dimmechan at yahoo.com>
• Date: Sat, 2 Dec 2006 05:11:43 -0500 (EST)
• References: <ekp4o4\$2fq\$1@smc.vnet.net>

It is!

For example try the following

Plus @@ Table[Random[Integer, {0, 10}]*x^Random[Integer, {0,
4}]*Sqrt[a^2 + b^2 - 2*a*b*Cos[theta]], {8}] + x
% /. Sqrt[a^2 + b^2 - 2*a*b*Cos[theta]] -> c
Solve[% == 0, x]
% /. c -> Sqrt[a^2 + b^2 - 2*a*b*Cos[theta]]

The following command will take to the proper place within Mathematica
book for learning more!

FrontEndExecute[{HelpBrowserLookup["MainBook", "2.5"]}]

Regards
Dimitris

aaronfude at gmail.com wrote:
> Hi,
>
> Is it possible to ask Mathematica to replace a long expression, such as
> Sqrt[a^2+b^2-2*a*b*Cos[theta]] with "c", whenever it encounters that
> long expression?
>
> Thanks!
>
> Aaron Fude

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