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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 5. Gradient 97<br />

5.15. Retningsafledt ☞ [S] 11.6 Directional derivatives and the . . .<br />

Eksempel 2 - figur<br />

z<br />

x<br />

1<br />

(1,2,0)<br />

/6<br />

u<br />

Retning π/6<br />

5.16. Retningsafledt, prikprodukt ☞ [S] 11.6 Directional derivatives and the . . .<br />

Bemærkning<br />

Den retningsafledede af f(x,y) i punktet (x,y) i retning af en enhedsvektor u = (a,b) kan ved brug<br />

af prikproduktet skrives<br />

7<br />

Duf(x,y) = fx(x,y)a + fy(x,y)b<br />

1<br />

y

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