\( \definecolor{colordef}{RGB}{249,49,84} \definecolor{colorprop}{RGB}{18,102,241} \)
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To find a primitive of \(f(x) = \dfrac{2x}{x^2+1}\), which composition rule should be used?
The form \(\dfrac{u'}{u}\) resulting in \(\ln(u)\)
The form \(u' \cdot u^n\) resulting in \(\frac{u^{n+1}}{n+1}\)
The form \(u' e^u\) resulting in \(e^u\)
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