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Question
$${\text{If}}\,{\text{log}}\frac{a}{b} + {\text{log}}\frac{b}{a} = {\text{log}}(a + b),$$      then:
Options:
A .  a + b = 1
B .  a - b = 1
C .  a = b
D .  a2 - b2 = 1
Answer: Option A

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