indefinite-integration

Question: What is the value of the integral $I=\int{\frac{dx}{(1+{{e}^{x}})\,\,(1+{{e}^{-x}})}}$

1) $\frac{-1}{1+{{e}^{x}}}$

2) $\frac{{{e}^{x}}}{1+{{e}^{x}}}$

3) $\frac{1}{1+{{e}^{x}}}$

4) None of these

Solution:

Explanation: No Explanation

Integration by substitution

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