1.

Letf(x)= (1)/(2)[f( xy ) + f((x)/(y)) ]AA x, y in R ^(+)such thatf(1)= 0, f^(1) (1)=2Now answer the following f(x)- f(y ) =

Answer»

`F(y/x)`
`f(x/y)`
`f(2X)`
`f(2Y)`

ANSWER :B


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