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Web skærmformat. - Aarhus Universitet

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IX. Opgaver – 2. Januar 2003 550<br />

3) Angiv en enhedsvektor u så at den retningsafledede Duf(5,2) er 0.<br />

2.4. Find gradient ☞ Matematik Alfa 1, Januar 2003<br />

Opgave 1 - løsning<br />

1) De partielle afledede beregnes<br />

2) Gradienten angives<br />

fx =<br />

fy =<br />

−y − 1<br />

(x + y) 2<br />

x − 1<br />

(x + y) 2<br />

fx(5,2) = − 3<br />

49<br />

∇f(5,2) = (fx(5,2),fy(5,2)) = (− 3 4<br />

,<br />

49 49 )<br />

2.5. Find gradient ☞ Matematik Alfa 1, Januar 2003<br />

Opgave 1 - løsning

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