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\(\S\S\) 7.9 Q[5] \( \int _0^\infty x \frac{[1-\exp(-x) ]\exp(-x)}{1+ \exp(-3x)} \,dx\)

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\(\S\S 7.9\) : : [1]  [2]  [3]  [4]  [5]  [6]  [7,8,9,10] [11]  [12]  [13]  [14]

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