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log (a-b)² = log a.b
a²-2ab+b² = ab
a²-3ab+b² = 0
(a/b)²-(3a/b)+1 = 0
((a/b)-(3/2))² = 5/4
a/b - 3/2 = √(5/4)
a/b = (3/2) + (1/2).√5
a/b = (1/2).(3+√5)......................opsi A