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alias: "tange en fonction de tan(x/2)"
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up::[[formules de trigonométrie]]
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type::$t = \tan\left(\frac{x}{2}\right)$
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title::$\tan(x) = \dfrac{2t}{1-t^{2}}$
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#maths/trigonométrie
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----
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On pose $\disp t = \tan\left(\frac{x}{2}\right)$
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$\tan(x) = \dfrac{2t}{1-t^{2}}$
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