indefinite-integration

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



1) ${{\cos }^{-1}}({{e}^{x}})+c$
2) $-{{\cos }^{-1}}({{e}^{x}})+c$
3) ${{\cos }^{-1}}({{e}^{2x}})+c$
4) $\sqrt{1-{{e}^{2x}}}+c$
Solution: Explanation: No Explanation
Integration by substitution

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