indefinite-integration

Question: The value of$\int_{{}}^{{}}{{{e}^{x}}{{\sec }^{2}}({{e}^{x}})\ dx}$ is



1) $\tan ({{e}^{x}})+k$
2) $\tan ({{e}^{x}})\ .\ e+k$
3) ${{e}^{x}}\tan x+k$
4) $\frac{\tan ({{e}^{x}})}{{{e}^{x}}}+k$
Solution: Explanation: No Explanation
Integration by substitution

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