70. The value of integral \( \int_{0}^{\infty} \frac{1-e^{-a x}}{x e^{x}} d x \), where \( a>-1 \) is equal to (1) \( \ln (1+

70. The value of integral \( \int_{0}^{\infty} \frac{1-e^{-a x}}{x e^{x}} d x \), where \( a>-1 \) is equal to (1) \( \ln (1+a) \) (2) \( \ln \left(\frac{1+a}{a}\right) \) (3) \( \ln \left(\frac{a}{1+a}\right) \) (4) \( 2 \ln (1+a) \)

70. The value of integral \( \int_{0}^{\infty} \frac{1-e^{-a x}}{x e^{x}} d x \), where \( a>-1 \) is equal to (1) \( \ln (1+a) \) (2) \( \ln \left(\frac{1+a}{a}\right) \) (3) \( \ln \left(\frac{a}{1+a}\right) \) (4) \( 2 \ln (1+a) \)

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