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I have got a Casio fx-82MS calculator, and I want to calcuate various logarithms with it, especially $\log₂(x)$-style logarithms. Unfortunately, its user interface contains buttons for just $\ln$ and $\log₁₀$.

How to do it with the existing set of buttons/commands?

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Use change of base property of a logarithm? – Inquest Mar 15 '12 at 13:14
$\log_a x={\ln x\over\ln a}$. – David Mitra Mar 15 '12 at 13:17
@Nunoxic, wow, is it possible? I'll search this function. David Mitra, your solution is great for me. – vakufo Mar 15 '12 at 13:18

According to David Mitra, $\log_a x={\ln x\over\ln a}$, what is absolutely usable for me.

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You could also use $\log_a x=\dfrac{\log_{10} x }{\log_{10} a }$ if you prefer (or accidentally press the wrong log button) – Henry Mar 15 '12 at 14:05

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