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log 81 = 4.log 3 ---> (inget sifat log kl ada yg dipangkatin bisa diturunin kan?)
lalu, karena log 3 = b,
jadi = 4b
dan gua ga ngerti kenapa harus ada log 2 = a. karena itu totally ga dipake, kecuali ada yg semacam angkanya kayak 6, jadi ada "log 2 . log 3"