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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 5. Gradient 108<br />

y<br />

1<br />

0 1<br />

Skalerede gradienter 0.1∇z for z = xe y .<br />

5.34. Opgave ☞ Matematik Alfa 1, August 2002<br />

Opgave 5<br />

Betragt funktionen f(x,y) = y 2 + ln(x 3 + y + 1).<br />

1. Angiv gradientvektoren ∇f(0,2).<br />

2. Angiv den retningsafledede af f i punktet P = (0,2) i retning givet ved enhedsvektoren<br />

(3/5,4/5).<br />

Løsning<br />

1. Gradienten beregnes<br />

fx = 3x 2 /(x 3 + y + 1)<br />

x

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