If f(x) = int1^x \ lnt/(1+t) \ dt where ...

If `f(x) = int_1^x \ lnt/(1+t) \ dt` where `x>0` then the values of `x` satisfying the equation `f(x)+f(1/x) = 2` are (i)`2` (ii)`e` (iii)`e^(-2)` (iv)`e^(2)`

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