If f(x)=underset(1)overset(x)int (log t)...

If `f(x)=underset(1)overset(x)int (log t)/(1+t) dt"then" f(x)+f((1)/(x))` is equal to

`1/4 (log x)^(2)`

`1/2 (log x)^(2)`

`log x`

`log x^2`

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