- Calculer $f(x)$ en fonction de $~x$.
- Déterminer $\lim\limits_{x \to +\infty} f(x)$.
Pour tout $x \in \mathbb{R}$ on pose :
\[f(x) = \int_x^{2x} \frac{t}{\sqrt{1+t^2}} \,dt\]
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