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f '(x) = ³log(3x)
f '(81) = ³log(3*81)
f '(81) = ³log3 + ³log81
f '(81) = ³log3 + ³log3⁴
f '(81) = 1 + 4 ³log3
f '(81) = 1 + 4
f '(81) = 5
Jadikan Sebagai Solusi Terbaik Aaaaaaa~ :D