If $$\log \frac{a}{b} + \log \frac{b}{a} = $$$$\,\log \left( {a + b} \right),$$then -

If $$\log \frac{a}{b} + \log \frac{b}{a} = $$$$\,\log \left( {a + b} \

1.	If $$\log \frac{a}{b} + \log \frac{b}{a} = $$$$\,\log \left( {a + b} \right),$$then -
A.	+ b = 1
B.	- b = 1
C.	= b
D.	2 - b2 = 1
Answer» B. - b = 1