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Minimizando este χ 2 que por definição é derivar com respeito a ca<strong>da</strong> uma <strong>da</strong>s incógnitas<br />

a j e igualar a zero., ter<strong>em</strong>os:<br />

2 k<br />

( χ )<br />

= { y − a f ( x ) − a f ( x ) − ... − a f ( x )} × ( − f ( x ))<br />

∂<br />

∂a<br />

j<br />

∑ 2<br />

i 1 1 i 2 2 i<br />

n n i<br />

j i<br />

= 0<br />

i<br />

Obtém-se com isto o seguinte sist<strong>em</strong>a de n – equações com n – incógnitas:<br />

k<br />

( x ) = a f ( x ) f ( x ) + a f ( x ) f ( x ) + + a f ( x ) f ( x )<br />

∑y i<br />

f<br />

j i 1 ∑ 1 i j i 2∑ 2 i j i<br />

...<br />

n∑<br />

i<br />

k<br />

i<br />

k<br />

i<br />

k<br />

i<br />

n<br />

i<br />

j<br />

i<br />

Para j = 1, t<strong>em</strong>os:<br />

k<br />

( x ) = a f ( x ) f ( x ) + a f ( x ) f ( x ) + + a f ( x ) f ( x )<br />

∑ i<br />

f1 i 1∑ 1 i 1 i 2∑ 2 i 1 i<br />

...<br />

n∑<br />

i<br />

k<br />

k<br />

k<br />

y<br />

n i 1<br />

i<br />

i<br />

i<br />

i<br />

Para j = 2, t<strong>em</strong>os:<br />

k<br />

( x ) = a f ( x ) f ( x ) + a f ( x ) f ( x ) + + a f ( x ) f ( x )<br />

∑ i<br />

f<br />

2 i 1∑ 1 i 2 i 2∑ 2 i 2 i<br />

...<br />

n∑<br />

i<br />

k<br />

k<br />

k<br />

y<br />

n i 2<br />

i<br />

i<br />

i<br />

i<br />

Para j = 3, t<strong>em</strong>os:<br />

k<br />

( x ) = a f ( x ) f ( x ) + a f ( x ) f ( x ) + + a f ( x ) f ( x )<br />

∑ i<br />

f3 i 1∑ 1 i 3 j i 2∑ 2 i 3 i<br />

...<br />

n∑<br />

i<br />

k<br />

k<br />

k<br />

y<br />

n i 3<br />

i<br />

i<br />

i<br />

i<br />

Fi<strong>na</strong>lmente, para j = n, t<strong>em</strong>os:<br />

k<br />

( x ) = a f ( x ) f ( x ) + a f ( x ) f ( x ) + + a f ( x ) f ( x )<br />

∑y i<br />

f<br />

j i 1 ∑ 1 i n i 2∑ 2 i n i<br />

...<br />

n∑<br />

i<br />

k<br />

i<br />

k<br />

i<br />

k<br />

i<br />

n<br />

i<br />

n<br />

i<br />

243

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