Integral of (log x)^n / x: substitute t = log x

1. A.
   $\frac{\log x}{x^3} + C$
2. B.
   $\frac{\log x^3}{3} + C$
3. C.
   $\frac{(\log x)^3}{2} + C$
4. D.
   $\frac{(\log x)^3}{3} + C$

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1. A.
   $\frac{1}{3}(\log x) + c$
2. B.
   $\frac{2}{3}(\log x)^2 + c$
3. C.
   $\frac{2}{3}(\log x)^2 + c$
4. D.
   $\frac{1}{12}(\log x)^2 + c$

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