from github to this gitea

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---
alias: "tan(2x)"
---
sibling:: [[tangente hyperbolique du double]]
up::[[formules de trigonométrie]]
sibling::[[tangente hyperbolique du double]]
type::"formule de duplication"
title::$\tan(2x) = \dfrac{2\tan(x)}{1-\tan^{2}(x)}$
#maths/trigonométrie
----
$\tan(2x) = \dfrac{2\tan(x)}{1-\tan^{2}(x)}$
Se déduit de la [[tangente d'une somme]]