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Re: Simple question: is it possible to take a derivative and solve for x ?

From	Tomas Garza <tgarza10@msn.com>
Newsgroups	comp.soft-sys.math.mathematica
Subject	Re: Simple question: is it possible to take a derivative and solve for x ?
Date	2011-05-30 10:36 +0000
Organization	Steven M. Christensen and Associates, Inc and MathTensor, Inc.
Message-ID	<irvrvb$8lc$1@smc.vnet.net> (permalink)

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I think you have too many unknown symbols, like v1, V1, l1, L1, C,... (by the way, C is a Mathematica symbol - don't use capital letters in your own symbols). Do they have a specific meaning?
-Tomas

> Date: Sun, 29 May 2011 07:36:37 -0400
> From: t27026t@yahoo.com.br
> Subject:  Simple question: is it possible to take a derivative and solve for x ?
> To: mathgroup@smc.vnet.net
>
> I am a beginner, and would like to know if it is possible to solve for x the first derivative of a long equation in Mathematica. Bear with me, my background is in Biomedical Sciences.
>
> I am typing the following command:
>
> Solve[D[((x*l1 + (1 - x)*l2)/((x^2*v1 + (1 - x)^2*v2 +  2*x*(1 - x)*c)^0.5))+((x*L1 + (1 - x)*L2)/((x^2*V1 + (1 - x)^2*V2 +  2*x*(1 - x)*C)^0.5)), x]==0,x]
>
> But Mathematica 8 simply stops, and no output is given.
>
> Any tips?
>
> Cheers!
>
> Alonso
>

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Re: Simple question: is it possible to take a derivative and solve for x ? Tomas Garza <tgarza10@msn.com> - 2011-05-30 10:36 +0000

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