indefinite-integration

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



1) $-\frac{1}{2({{e}^{2x}}+1)}+c$
2) $\frac{1}{2({{e}^{2x}}+1)}+c$
3) $-\frac{1}{{{e}^{2x}}+1}$
4) None of these
Solution: Explanation: No Explanation
Integration by substitution

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