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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 1. Grafiske/numeriske metoder 321<br />

Tabellæg løsning til<br />

y ′ = x 2 + y 2 − 1, y(0) = 1<br />

n xn yn<br />

1 0.1000 1.0000<br />

2 0.2000 1.0010<br />

3 0.3000 1.0052<br />

4 0.4000 1.0152<br />

5 0.5000 1.0343<br />

n xn yn<br />

6 0.6000 1.0663<br />

7 0.7000 1.1160<br />

8 0.8000 1.1895<br />

9 0.9000 1.2950<br />

10 1.0000 1.4438<br />

1.19. Separabel ligning ☞ [S] 7.3 Separable equations<br />

Definition<br />

En 1. ordens differentialligning<br />

1<br />

kaldes separabel.<br />

Løsning<br />

Integration<br />

2<br />

Fastlægger løsninger optil en konstant.<br />

<br />

dy<br />

= g(x)f(y)<br />

dx<br />

dy<br />

f(y) =<br />

<br />

g(x)dx<br />

1.20. Separabel ligning ☞ [S] 7.3 Separable equations

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