Date: Mar 22, 2013 7:59 AM
Author: Torsten
Subject: Re: 3 equation of cosine law
"DHAAH JOHARI" wrote in message <kihfp2$dmt$1@newscl01ah.mathworks.com>...

> please help me..

> anyone know how to solve this problem..

> I have 3 simultaneous equation based on the cosine law..

>

> x^2=y^2+233600-966.64*y*cos(z-65.56);

> x^2=y^2+155600-788.92*y*cos(z-59.53);

> x^2=y^2+97600-624.82*y*cos(z-50.19);

>

> i know the answer for x=444.46, y=149.25

> but when i do the the coding like this below, i didn't get the same answer..i got

> x=-449.15, y=-295.21 and z=61.28

>

> syms xyz

> solutions = solve('x^2 = y^2+233600-966.64*y*cos(z-65.56) ',' x^2 = y^2+155600-788.92*y*cos(z-59.53)','x^2 = y^2+97600-624.82*y*cos(z-50.19)')

> [solutions.x solutions.y solutions.z]

I think you want to use "cosd" instead of "cos" in your equations.

Best wishes

Torsten.