1. The problem statement, all variables and given/known data
[itex] \int sin e^{-x}+e^x cos e^{-x}\,dx[/itex]
Find the integral above
2. Relevant equations
3. The attempt at a solution
I tried substituting [itex]u=e^{-x}[/itex], but i get [itex] \int \frac{sin u}{u}+\frac{cos u}{u^2} \,du[/itex], which is non-integrable function.
[itex] \int sin e^{-x}+e^x cos e^{-x}\,dx[/itex]
Find the integral above
2. Relevant equations
3. The attempt at a solution
I tried substituting [itex]u=e^{-x}[/itex], but i get [itex] \int \frac{sin u}{u}+\frac{cos u}{u^2} \,du[/itex], which is non-integrable function.
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