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Re: Help with Solve

  • To: mathgroup at smc.vnet.net
  • Subject: [mg112383] Re: Help with Solve
  • From: Eduardo Cavazos <wayo.cavazos at gmail.com>
  • Date: Sat, 11 Sep 2010 05:46:46 -0400 (EDT)
  • References: <i6a5i6$kne$1@smc.vnet.net>

On Sep 9, 3:23 am, Eduardo  Cavazos <wayo.cava... at gmail.com> wrote:

> Here's a couple of equations:
>
> eq1 = n*Sin[x] == (m*v^2)/r;
> eq2 = n*Cos[x] == m*g;
>
> The goal is to solve for 'x'.
>
> I can do this in a roundabout way via:
>
>     Solve[eq1 /. Solve[eq2, n], x]

I should point out that the answer that I get from using Solve this
way is:

    {{x -> ArcTan[v^2/(g r)]}}

which is form the answer I'm looking for. :-) Again, I'm just
wondering if Mathematica can do the work for me, instead of having to
manually eliminate 'n' in a separate step.

Sjoerd and Bob recommended using Reduce. Thanks for the tip! I tried
to use Reduce but the results it produced were not in the above form.

Ed


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