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Ajout d'une formule utile.
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docs/2e/trigo/equations-trigo.md

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@@ -23,6 +23,7 @@ d'équations:
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\cos^2(x) + \sin^2(x) &= 1\\
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\sin(x) &= \cos\left(\dfrac{\pi}{2} - x\right)\\
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\cos(x) &= \sin\left(\dfrac{\pi}{2} - x\right) = \sin\left(\dfrac{\pi}{2} + x\right)\\
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\tan(x) &= \dfrac{\sin(x)}{\cos(x)}\\
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```
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````
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