Khan Academy on a Stick
Proof: a log b = log(b^a), log a - log b = log(a/b)
Proofs of the logarithm properties: A(log B) = log (B^A) and log A - log B = log (A/B)
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Proofs of the logarithm properties: A(log B) = log (B^A) and log A - log B = log (A/B)
If the above player doesn't work, try this direct link.