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            <video:description>On trace la courbe de la fonction y=2cos(1/2x)-1 à partir de la courbe de la fonction y=cos(x) : les transformations à réaliser pour passer de la fonction de référence y=cos(x) à la fonction y=2cos(1/2x)-1 ont, chacune, un effet sur la courbe de référence (axe de symétrie, période et amplitude). On les applique dans le bon ordre.</video:description>
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