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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 5. Gradient 90<br />

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

2 Definition - figur<br />

y<br />

1<br />

1<br />

0<br />

(x0, y0)<br />

hu = (x0 + ha, y0 + hb)<br />

1<br />

1<br />

u = (a, b)<br />

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

Eksempel<br />

Den retningsafledede af funktionen f(x,y) = x2 +y i punktet (1,1) i retningen u = ( 3 4<br />

5 , 5 ) beregnes<br />

x

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