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9log1/6 = -1/2 x ³log 6 = -1/2 x (1 + ³log2) = -1/2 x (1 + 1/²log3)
= -1/2 x (1 + 1/a)
= -1/2 - 1/2a
⇔ ²log 3 + ²log 5
⇔ a + b