{\rm{If}}\log {a \over b} + \log {b \over a} = \log \left( {a + b} \ri – McqOptions

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1.	{\rm{If}}\log {a \over b} + \log {b \over a} = \log \left( {a + b} \right),{\rm{then:}}$$%!
A.	a + b = 1
B.	a - b = 1
C.	a = b
D.	a2 - b2 = 1
Answer» B. a - b = 1

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