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gaobo9109
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Homework Statement
[itex] \int sin e^{-x}+e^x cos e^{-x}\,dx[/itex]
Find the integral above
Homework Equations
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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