Someone wrote in [community profile] fandomsecrets 2013-05-07 11:35 pm (UTC)

Re: I need help

Integration by parts and u-substitution are the times you're allowed to treat du/dx the derivative as a fraction. Most of the time, you're not supposed to do that, but in this case you just go ahead and pretend it is. :)

Does that help?
(863 comments)

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