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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 5. Gradient 100<br />

5.21. Gradient ☞ [S] 11.6 Directional derivatives and the . . .<br />

Eksempel - figur<br />

y<br />

(1,1)<br />

1<br />

u<br />

∇f(1,1)<br />

∇f(1,1) = (2,1), u = ( 3 4<br />

5 , 5 )<br />

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

Eksempel 4<br />

Gradienten af f(x,y) = x 2 y 3 − 4y er<br />

∇f(x,y) = (2xy 3 ,3x 2 y 2 − 4)<br />

For den retningsafledede i retning (2,5) bruges enhedsvektoren<br />

u = 1<br />

√ 29 (2,5)<br />

x

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