1.

iff(x)= (x-1)/(x+1) thef(2x )is

Answer»

`(F(X) +1)/(f(x) +3)`
`(3f(x)+1)/(f(x) +3)`
`(f(x)+3 )/(f(x) +1)`
`(f(x)+3)/(3f(x)+1)`

Answer :B


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