$\displaystyle \int \frac{1}{xln5x} dx$ .
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Substitute $\displaystyle y=\ln{5x}$ and you should get a very familiar integral. - Hollywood
Originally Posted by mastermin346 $\displaystyle \int \frac{1}{xln5x} dx$ . You don't need parts! What is the derivative of $\displaystyle 5ln(ln(5x))~?$
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