Question
List some things which would suggest that a certain substitution $u(x)$ could be a useful choice. What do you look for when choosing $u(x)$ ?
Step 1
For example, consider the integral $\int \frac{1}{x \ln(x)} dx$. We can rewrite this as $\int \frac{1}{x} \cdot \frac{1}{\ln(x)} dx$. Show more…
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