- #1

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[(e^(4x))/(e^(8x))+9]dx

-I think that u=e^(2x)

so then du=e^(2x)dx

then the answer would end up being [(e^(4x)+9)/(-1)]^(-1)

but it was incorrect; I think that my u might be wrong and that's where the problem is, but I am not sure. Please help, thank you!