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Calculer la limite de f_n(x) - nx + 2 quand x tend vers -infinity et interpréter le résultat graphiquement.

Mathematics

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Partie I

1-a) Calculer lim⁡x→−∞(fn(x)−nx+2)\lim_{x \to -\infty} (f_n(x) - nx + 2) puis interpréter graphiquement le résultat obtenu.

  1. Substituer l'expression de fn(x)f_n(x) dans la limite.

    fn(x)−nx+2=(−2ex1+ex+nx)−nx+2=−2ex1+ex+2f_n(x) - nx + 2 = \left( \frac{-2e^x}{1+e^x} + nx \right) - nx + 2 = \frac{-2e^x}{1+e^x} + 2
  2. Évaluer la limite lorsque x→−∞x \to -\infty.

    Lorsque x→−∞x \to -\infty, $

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