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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 6. Maksimum/minimum 118<br />

6.9. Lokalt maksimum/minimum ☞ [S] 11.7 Maximum and minimum values<br />

En variabel - figur<br />

y<br />

lokalt maksimum<br />

f ′ (x2) = 0<br />

x1<br />

x2<br />

f ′ (x1) = 0<br />

x<br />

lokalt minimum<br />

6.10. 1. ordens kriterium ☞ [S] 11.7 Maximum and minimum values<br />

2 Sætning<br />

Hvis f(x,y) har lokalt maksimum/minimum, lokalt ekstremum, i punktet (a,b) og de partielle afledede<br />

eksisterer i (a,b) så er<br />

fx(a,b) = 0 = fy(a,b)

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