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Web skærmformat. - Aarhus Universitet

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III. Potensrækker – 3. Potensrækker 289<br />

f ′ (x) = c1 + 2c2x + 3c3x 2 + 4c4x 3 + ...<br />

f ′′ (x) = 2 · c2 + 3 · 2 · c3x + 4 · 3 · c4x 2 + ...<br />

f ′′′ (x) = 3 · 2 · 1 · c3 + 4 · 3 · 2 · c4x + ...<br />

f (4) (x) = 4 · 3 · 2 · 1 · c4 + 5 · 4 · 3 · 2 · c5x + ...<br />

3.20. Gentagen differentiation ☞ [S] 8.7 Taylor and Maclaurin series<br />

Udregning - fortsat<br />

Indsættes x = 0, fås<br />

f(0) = c0, f ′ (0) = c1,<br />

generelt<br />

eller<br />

f ′′ (0) = 2 · c2, f ′′′ (0) = 3 · 2 · c3,<br />

f (4) (0) = 4 · 3 · 2 · c4,...<br />

f (n) (0) = n · (n − 1) · ... · 2 · 1 · cn<br />

f (n) (0) = n! · cn

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