indefinite-integration

Question: $\int_{{}}^{{}}{\frac{dx}{{{e}^{x}}+1-2{{e}^{-x}}}=}$

1) $\log ({{e}^{x}}-1)-\log ({{e}^{x}}+2)+c$

2) $\frac{1}{2}\log ({{e}^{x}}-1)-\frac{1}{3}\log ({{e}^{x}}+2)+c$

3) $\frac{1}{3}\log ({{e}^{x}}-1)-\frac{1}{3}\log ({{e}^{x}}+2)+c$

4) $\frac{1}{3}\log ({{e}^{x}}-1)+\frac{1}{3}\log ({{e}^{x}}+2)+c$

Solution:

Explanation: No Explanation

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