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$\log_{c}(a) + \log_{c}(b)

\log_{c}(ab)$= Två logaritmer som adderas kan skrivas som en logaritm där argumenten multiplicerats, t.ex.

lo g_{3} (4) + lo g_{3} (2) = lo g_{3} (4 \cdot 2) .

Likheten gäller bara om logaritmerna har samma bas.

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