1.3 Normal equations. 
25 dx, - [dx! = 0 
25 dy, -Ady1-=-0 
50 a4 à a N = 
He 251 7 
80 a4 d aN,. = 
My ^ 252 ” 
2 2 
100 à da + 50 à dB -aN = | 
50 a” dB + 50 a” de -aN, 
253 
2 
| 
© 
54 
The solution of this system is 
L Tdx] 
be ME 
. [dy] 
dy F 55 
mnl. N51 
m7 P508 
In] Nou 
y 150% 
N253.^ N254 
ie ua 
4 N554 ^ N253 
$8 I= quM 
N551^ 4dx, tdx,,-dx,,-2dx,, *2dx, ,*dx,,- 
- dx. , -2dx, -+2 dx, {++dx. , -dx -2dx, + 
24 
+ 2dx, 
252 
25 31 32 34 
*dx,,-dx,,.-2dx,.t2adx.;tdx..;-dx..,-2dx 
42 44 45 51 52 54 
=e 2ldy yt dy), ty t dy, t dy, - 
= fdyz; dy25 + dys + dy2, + dy23) + 
+ 
2(dysı * 9752 + 4755 + dy, + dy) 
(dy, t dy, + dy,3 + dyı4 * dyıs) + 
      
    
   
    
    
   
   
   
            
  
   
    
55 
  
  
  
S1 
g 
de 
Ce