eChallenge Integral

Calculus Level 4

Find \(f\left( e \right) +f\left( \frac { 1 }{ e } \right) \) where \(f\left( x \right) =\int _{ 1 }^{ x }{ \frac { \ln { t } }{ 1+t } dt} \) for \(x>0\).

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