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cours/cosinus hyperbolique du double.md
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up::formules de trigonométrie sibling::sinus hyperbolique du double type::"formule de duplication", "hyperbolique" title::$\mathrm{ch}(2x) = \mathrm{ch}^{2}(x)+\mathrm{sh}^{2}(x)$ #maths/trigonométrie

\mathrm{ch}(2x) = \mathrm{ch}^{2}(x)+\mathrm{sh}^{2}(x)