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log90 = log10 + log9 = 1 + log3³ = 1 + 2 log3 = 1 + 2 log(12/4) =
= 1 + 2 × (log12 - log4) = 1 + 2 × (log12 - log2²) = 1 + 2 × (log12 - 2log2) = 1 + 2 × (a - 2b) = 1 + 2a - 4b