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From: <HIDDEN>
Newsgroups: comp.soft-sys.matlab
Subject: Re: 3 equation of cosine law
Date: Mon, 25 Mar 2013 08:30:07 +0000 (UTC)
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"DHAAH JOHARI" wrote in message <kik48r$k5a$1@newscl01ah.mathworks.com>...
> > I think you want to use "cosd" instead of "cos" in your equations.
> > 
> > Best wishes
> > Torsten.
> 
> Thanks Torsten..thank you very much!
> but I still didn't get the answers,..
> It said error..i don't know how to fix it
> 
> syms xyz
> solutions = solve('x^2 = y^2+233600-966.64*y*cosd(z-65.56) ',' x^2 = y^2+155600-788.92*y*cosd(z-59.53)','x^2 = y^2+97600-624.82*y*cosd(z-50.19)')
> [solutions.x solutions.y solutions.z]

I think cosd does not accept symbolic arguments.
Convert 65.56°, 59.53° and 50.19° to radians and try again.
And define 
syms x y z
instead of
syms xyz

Best wishes
Torsten.