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```table-of-contents
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title: Fiche de révision DS1 de maths
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```
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<div style="page-break-after: always;"></div>
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# 1. Rappel primitive et dérivé
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## IPP
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$\int u \, v' \, dx = u v - \int u' \, v \, dx$
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## Fréquence
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$\omega = {2\pi}*F$ ou $\omega = \frac{2\pi}{T}$
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$F = \frac{{1}}{T}$
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<div style="page-break-after: always;"></div>
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## Coefficients de Fourier
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- $a_0$ : (tous le temps)
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$$a_0 = \frac{1}{2\pi} \int_{-\pi}^\pi f(x) \, dx$$
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$$a_0 = \frac{1}{T} \int_{d}^{d+T} f(x) \, dx$$
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- $a_n$ : (si paire)
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$$a_n = \frac{1}{\pi} \int_{-\pi}^\pi f(x) \cos(nx) \, dx$$
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$$a_n = \frac{1}{T} \int_{-\pi}^\pi f(x) \cos(nx) \, dx$$
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- $b_n$ : (si impaire)
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$$b_n = \frac{1}{\pi} \int_{-\pi}^\pi f(x) \sin(nx) \, dx$$
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$$b_n = \frac{2}{T} \int_{d}^{d+T} f(x) \sin(nx) \, dx$$
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## Propriétés
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- **Convergence** : La série converge en moyenne quadratique dans $L^2([-\pi, \pi])$. (Pas vu en cours mais je le note la quand même au cas ou)
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