Re: can anyone solve this equation?

• To: mathgroup at smc.vnet.net
• Subject: [mg58159] Re: can anyone solve this equation?
• From: Paul Abbott <paul at physics.uwa.edu.au>
• Date: Mon, 20 Jun 2005 05:52:22 -0400 (EDT)
• Organization: The University of Western Australia
• References: <d8rhj9\$i7n\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```In article <d8rhj9\$i7n\$1 at smc.vnet.net>,
Chris Chiasson <chris.chiasson at gmail.com> wrote:

> Can anyone solve the following equation (for theta_4)?

Essentially, you are solving the equation

FullSimplify[Solve[a - Cos[t] - Sqrt[R^2 - Sin[t]^2] == x, t]]

where x = 2 n rhs/d is a constant multiple of your right-hand side, rhs,
t is theta_4, and a = R + 2/(c - 1) + 1. This is, of course, trivial. I
expect that Solve struggles with your expression because of the length
and/or complexity of rhs.

Only an engineer would work with such expressions!

Personally, I like using subscripted expressions in Mathematica. They
are not without their difficulties and subtleties -- but are preferable
to using \[UnderBracket].

Cheers,
Paul

--
Paul Abbott                                      Phone: +61 8 6488 2734
School of Physics, M013                            Fax: +61 8 6488 1014
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AUSTRALIA                               http://physics.uwa.edu.au/~paul
http://InternationalMathematicaSymposium.org/IMS2005/

```

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