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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 1. Grafiske/numeriske metoder 317<br />

y<br />

1<br />

0 1<br />

1.12. Grafisk løsning ☞ [S] 7.2 Direction fields and Euler’s method<br />

Retningsfelt<br />

For ligningen<br />

y ′ = x 2 + y 2 − 1<br />

prøver vi at tilnærme grafen for løsningerne y(x) med små tangentstykker.<br />

I et givet punkt (x1,y1) vil en tangent have ligning<br />

y = y1 + (x 2 1 + y 2 1 − 1)(x − x1)<br />

1.13. Grafisk løsning ☞ [S] 7.2 Direction fields and Euler’s method<br />

x

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