Question
If $f(x)=\int_{1}^{x}\left(\frac{1}{x}-\frac{1}{t}\right) f^{\prime}(t) d t+\frac{1}{x}, x>0$, then $f(x)$ isequal to(a) $e^{1 / 2-1}$(b) $e^{z-1}$(c) $x e^{x-1}$(d) $x e^{1 / x-1}$
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