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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 2. 1. ordens ligninger 331<br />

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

Opgave 1 - fortsat<br />

<br />

A(x) = a(x)dx = −2dx = −2x<br />

<br />

B(x) = e −A(x) <br />

b(x)dx = e 2x (xe −2x + 3)dx<br />

Som giver<br />

= 1<br />

2 x2 + 3<br />

2 e2x<br />

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

Opgave 1 - fortsat<br />

fuldstændig løsning<br />

y(x) = Ce A(x) + B(x)e A(x)<br />

= Ce −2x + ( 1<br />

2 x2 + 3<br />

2 e2x )e −2x<br />

= Ce −2x + 1<br />

2 x2 e −2x + 3<br />

2<br />

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

Opgave 1 - fortsat

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