Let \( a \) and \( b \) be two positive real numbers. Then the value of \( \int_{a}^{b} \frac{e^...
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0Let \( a \) and \( b \) be two positive real numbers. Then the value of \( \int_{a}^{b} \frac{e^{x / a}-e^{b / x}}{x} d x \) is
(A) \( a b \)
(B) \( 1 / a b \)
(C) \( e^{a b} \)
(D) undefined
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