How do you find the Integral #(ln(3x))^2dx#?
Substitution doesn't seem to be working, so try the next less simple method Integration by Parts.
Try something, judge whether we seem to be making progress.
(Yes, really. There's no cookbook to solve every problem.)
Well, we can't integrate, so let's differentiate.
With these choices, we get
Applying Integration by Parts gives us
(By parts, to get
Note: you can learn a lot, by checking the answer by differentiating.
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