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**mrantoine** Alright, I'm pretty rusty on the details of substitution since we learned that several months ago lol but I've got this so far

$\displaystyle \int $ (e^(2x))(tan(e^(2x)))^2 dx

$\displaystyle \int $ (tan u)^2 du

and now im stuck again. If I split tan^2 u into sin^2 u/cos^2 u, then I can't figure out what to substitute next. Sorry I need so much help on this problem, I'm pretty embarrassed considering that (tan u)^2 isn't that elaborate of a function :/

Thanks so much you guys!