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i know the answer is ln(1+x^2) but why
let u = 1+x^2
= ln (1 + x^2) oh ok this is the rule integral of f'(x) / f(x) = ln f(x)
what jimmyrep said. as for "why" his answer makes more sense, i just showed how to get it
check by differentiating using chain rule and you will see why u sub works
Thank you, the u substitution was enough to illustrate the process. I appreciate the help.
Jimmy Rep's general rule is pretty useful too. If anything, you should remember that the next time you run into a similar one. U sub will come naturally when you remember the general rule.
Yea, I took some time away from this calculus based stuff when I studied linear algebra and so when I came back to it, I panicked and was like is this partial fractions? integration by parts? and I just couldnt figure it out, but I know you guys always come through.