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Web skærmformat. - Aarhus Universitet

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I. Differentiation – 3. Tangentplan 54<br />

til grafen<br />

En ligning for tangentlinjen er<br />

x ↦→ (x,f(x))<br />

y − b = f ′ (a)(x − a)<br />

3.4. Find tangentlinjen ☞ [S] 2.7 Derivatives<br />

Eksempel 2<br />

Find ligningen for tangentlinjen til y = x 2 − 8x + 9 i punktet (3, −6).<br />

Den afledede er<br />

y ′ = 2x − 8, y ′ (3) = −2<br />

Ligningen for tangentlinjen er<br />

eller<br />

y − (−6) = (−2)(x − 3)<br />

y = −2x<br />

3.5. Tangentplan ☞ [S] 11.4 Tangent planes and linear approximations

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