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maka nilai dari :
a) ²log(5/3) = ²log5 - ²log3 = b - a
b) ²log15 = ²log(3x5) = ²log3 + ²log5 = a + b
= b - a
b. ^2 log 15 = ^2 log (3 x 5)
= ^2 log 3 + ^2 log 5
= a + b