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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 7. Lagrangemetoden 159<br />

g(x,y,z) = k<br />

h(x,y,z) = c<br />

7.33. To betingelser ☞ [S] 11.8 Lagrange multipliers<br />

Eksempel 5<br />

Lagranges ligningssystem for bestemmelse af ekstremumspunkter for funktion f = x + 2y + 3z<br />

under begræsningen g = x − y + z = 1, h = x 2 + y 2 = 1.<br />

1 = λ + µ2x<br />

2 = −λ + µ2y<br />

3 = λ<br />

x − y + z = 1<br />

x 2 + y 2 = 1<br />

7.34. To betingelser ☞ [S] 11.8 Lagrange multipliers<br />

Eksempel 5 - fortsat<br />

Løsningen giver relevante punkter<br />

(x,y,z) = (− 2<br />

√ 29 , 5<br />

√ 29 ,1 + 7<br />

√ 29 )

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