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AP Calculus

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I need to find the integral:
int:(x^2+2x+3)/(x^3+3x+9) dx

I think I am supposed to use the rule: int:1/u du=ln|u|+C

But I don't know what to do first.

Thanks for your help! :-)

Oh- and the answer the back of my book gives is (1/3)ln|x^3+3x^2+9x|+C

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