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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 6. Maksimum/minimum 120<br />

z<br />

z<br />

x<br />

y<br />

lokalt maksimum<br />

x<br />

y<br />

Saddelpunkt<br />

6.13. Find ekstremumspunkter ☞ [S] 11.7 Maximum and minimum values<br />

Eksempel 1<br />

har kritisk punkt<br />

Omskrivningen<br />

f(x,y) = x 2 + y 2 − 2x − 6y + 14<br />

∇f(x,y) = (2x − 2,2y − 6) = 0 ⇔ (x,y) = (1,3)<br />

f(x,y) = (x − 1) 2 + (y − 3) 2 + 4<br />

viser, at (1,3) er et absolut minimum på D = R 2 .

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