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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 1. Grafiske/numeriske metoder 322<br />

Eksempel 1<br />

dy<br />

dx =<br />

6x2 2y + cos(y)<br />

er separabel.<br />

Løsning <br />

<br />

(2y + cos(y))dy = 6x 2 dx<br />

Giver løsning bestemt ved ligningen<br />

3 y 2 + sin(y) = 2x 3 + C<br />

1.21. Logistisk ligning ☞ [S] 7.5 The logistic equation<br />

Eksempel<br />

1. ordens differentialligningen<br />

1<br />

kaldes den logistiske ligning.<br />

Løsning<br />

Ligningen er separabel<br />

2<br />

<br />

dP<br />

dt<br />

= kP(1 − P<br />

K )<br />

dP<br />

P(1 − P/K) =<br />

<br />

kdt

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