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September 29th, 2008, 03:19 AM   #1
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solving equation problem

Hello!

I have a math problem (i'm writing a computer program). I want to get new position of a point by inputing angles. I need to get x, y and z coordinates of a point sEP from three equations... I'll write them:

.....................K1 * (sEP.X - K2) + K3 * (sEP.X - K2)
aCosVF = ----------------------------------------------------------------- ,
.............Sqrt(number) * Sqrt( (sEP.X - K2)^2 + (sEP.Y - K4)^2 )


......................K5 * (sEP.Y - K4) + K6 * (sEP.Z - K7)
aCosVS = ------------------------------------------------------------------ ,
............Sqrt(number2) * Sqrt( (sEP.Y - K4)^2 + (sEP.Z - K7)^2 )


......................K1 * (sEP.X - K2) + K8 * (sEP.Z - K7)
aCosH = ----------------------------------------------------------------- ,
...........Sqrt(number3) * Sqrt( (sEP.X - K2)^2 + (sEP.Z - K7)^2 )


where K1,...,K7 and aCosVF, aCosVS and aCosH are given numbers. I need to get the equations from 3D point sEP, that means sEP.X, sEP.Y and sEP.Z. I'm not much of a mathematician so if anyone has the knowledge and time i would be most grateful!!

Thanks.

PS: please ignore the dots in front of K1, K5 and Sqrt because they are for aligning ...
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September 30th, 2008, 01:51 AM   #2
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Re: solving equation problem

Hello again, i have done some calculating and have another question:

is there any way to lose the sqrt in expresion:

sqrt(1 - x^2 / y^2) ???

Thanks...
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