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Hi, while working on some integration problems today, I came across this one:
I multiplied it out:
(Edit: it's supposed to say x^2+2x in the first term)
And with some trial and error I got an answer:
When I differentiate this I get back what I started out with.
But trial and error isn't usually the best way to get an answer, so can anyone tell me which steps I need to take here?
Should I be using U-substitution?