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13 Differentialrechnung

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13.2 Ableitungsregeln

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13.2.6 Logarithmische Ableitung

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Beispiel 13 - 78

f(x) = y = xsin x .

ln f(x) = ln(xsin x)
ln f(x) = sin x ⋅ ln(x)
u =f(x)äußere Funktion
F(u) = ln(u)innere Funktion
d ln(u) du ⋅du dx = cos x ⋅ ln x + (sin x) ⋅1 x
1f(x) ⋅ f′(x) = cos x ⋅ ln x + (sin x) ⋅1 x
f′(x) =(cos x ⋅ ln x + (sin x) ⋅1 x) ⋅ f(x)
=(cos x ⋅ ln x + (sin x) ⋅1 x) ⋅ xsin x

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